{
  "apiVersion": "v0.1",
  "methodology": "https://sourcescore.org/methodology/",
  "generated": "2026-05-29T15:21:25.304Z",
  "count": 17,
  "lists": [
    {
      "slug": "sources-overall",
      "title": "Best sources overall for AI citation",
      "intent": "Top 25 sources on the SourceScore Index",
      "description": "The 25 highest-scoring sources on the SourceScore Index — ranked by composite Citation Discipline + Modern Reference + Citation Velocity. The ones AI engines surface first.",
      "signalCriterion": "SourceScore Index (composite weighted mean), descending",
      "count": 25,
      "canonical": "https://sourcescore.org/best/sources-overall/",
      "api": "https://sourcescore.org/api/best/sources-overall.json",
      "topSource": {
        "slug": "sec-gov",
        "name": "U.S. Securities and Exchange Commission",
        "index": 96,
        "grade": "A+"
      }
    },
    {
      "slug": "news-sources",
      "title": "Best news sources for AI citation",
      "intent": "Top tier-1 news publications",
      "description": "The 12 tier-1 news publications with the highest SourceScore Index — the news sources AI engines cite most often when answering current-events queries.",
      "signalCriterion": "Index score, filtered to News category, descending",
      "count": 12,
      "canonical": "https://sourcescore.org/best/news-sources/",
      "api": "https://sourcescore.org/api/best/news-sources.json",
      "topSource": {
        "slug": "reuters",
        "name": "Reuters",
        "index": 89,
        "grade": "A"
      }
    },
    {
      "slug": "academic-journals",
      "title": "Best peer-reviewed academic journals for citation",
      "intent": "Gold-standard peer-reviewed publications",
      "description": "The top 10 peer-reviewed academic journals + databases on the SourceScore Index — the citation backbone of scientific + scholarly writing.",
      "signalCriterion": "Index score, filtered to Academic category, descending",
      "count": 10,
      "canonical": "https://sourcescore.org/best/academic-journals/",
      "api": "https://sourcescore.org/api/best/academic-journals.json",
      "topSource": {
        "slug": "doi-org",
        "name": "DOI (CrossRef Resolver)",
        "index": 95,
        "grade": "A+"
      }
    },
    {
      "slug": "government-sources",
      "title": "Best government primary sources for citation",
      "intent": "Tier-1 government statistical + regulatory data",
      "description": "The 12 highest-scoring government primary sources on the SourceScore Index — the original public-record data that AI engines cite for economic, demographic, scientific, and regulatory claims.",
      "signalCriterion": "Index score, filtered to Government category, descending",
      "count": 12,
      "canonical": "https://sourcescore.org/best/government-sources/",
      "api": "https://sourcescore.org/api/best/government-sources.json",
      "topSource": {
        "slug": "sec-gov",
        "name": "U.S. Securities and Exchange Commission",
        "index": 96,
        "grade": "A+"
      }
    },
    {
      "slug": "health-sources",
      "title": "Best health + medical sources for citation",
      "intent": "Tier-1 clinical + health-information authorities",
      "description": "The 8 highest-scoring health + medical sources on the SourceScore Index — the clinical authorities AI engines surface for symptom + condition + treatment queries.",
      "signalCriterion": "Index score, filtered to Health category, descending",
      "count": 8,
      "canonical": "https://sourcescore.org/best/health-sources/",
      "api": "https://sourcescore.org/api/best/health-sources.json",
      "topSource": {
        "slug": "nejm",
        "name": "New England Journal of Medicine",
        "index": 87,
        "grade": "A"
      }
    },
    {
      "slug": "reference-sources",
      "title": "Best reference works for AI citation",
      "intent": "Encyclopedia + structured-knowledge references",
      "description": "The top reference works on the SourceScore Index — Wikipedia, MDN Web Docs, Britannica, Stanford Encyclopedia of Philosophy. Default fallback citations for AI engines.",
      "signalCriterion": "Index score, filtered to Reference category, descending",
      "count": 4,
      "canonical": "https://sourcescore.org/best/reference-sources/",
      "api": "https://sourcescore.org/api/best/reference-sources.json",
      "topSource": {
        "slug": "wikipedia-en",
        "name": "Wikipedia (English)",
        "index": 94,
        "grade": "A"
      }
    },
    {
      "slug": "tech-sources",
      "title": "Best tech sources for AI citation",
      "intent": "Top tech-news + analysis publications",
      "description": "The 10 highest-scoring tech-news + analysis sources on the SourceScore Index — the tech publications AI engines cite for product, industry, and engineering queries.",
      "signalCriterion": "Index score, filtered to Tech News category, descending",
      "count": 10,
      "canonical": "https://sourcescore.org/best/tech-sources/",
      "api": "https://sourcescore.org/api/best/tech-sources.json",
      "topSource": {
        "slug": "mit-tech-review",
        "name": "MIT Technology Review",
        "index": 81,
        "grade": "B"
      }
    },
    {
      "slug": "international-news",
      "title": "Best international news sources (non-US/UK)",
      "intent": "Global tier-1 news beyond Anglo-American press",
      "description": "The top non-US/non-UK news publications on the SourceScore Index — Le Monde, Der Spiegel, SCMP, Asahi Shimbun, El País, and others. Citation diversity beyond Anglo press.",
      "signalCriterion": "Index score, filtered to News category and non-US/UK domains, descending",
      "count": 9,
      "canonical": "https://sourcescore.org/best/international-news/",
      "api": "https://sourcescore.org/api/best/international-news.json",
      "topSource": {
        "slug": "the-conversation",
        "name": "The Conversation",
        "index": 82,
        "grade": "B"
      }
    },
    {
      "slug": "ai-citation-sources",
      "title": "Best sources for AI engines (ChatGPT, Claude, Perplexity)",
      "intent": "Highest Citation Velocity — sources AI engines surface most",
      "description": "The 15 sources with the highest Citation Velocity on the SourceScore Index — the sources ChatGPT, Claude, Perplexity, and Gemini cite most often when answering questions.",
      "signalCriterion": "Citation Velocity sub-score, descending",
      "count": 15,
      "canonical": "https://sourcescore.org/best/ai-citation-sources/",
      "api": "https://sourcescore.org/api/best/ai-citation-sources.json",
      "topSource": {
        "slug": "nih-gov",
        "name": "U.S. National Institutes of Health",
        "index": 95,
        "grade": "A+"
      }
    },
    {
      "slug": "free-sources",
      "title": "Best paywall-free sources for citation",
      "intent": "Highest Modern Reference — open-access + machine-readable",
      "description": "The 15 highest-Modern-Reference sources on the SourceScore Index — open-access, machine-readable, schema-rich. The sources you can always link to without a paywall.",
      "signalCriterion": "Modern Reference sub-score, descending",
      "count": 15,
      "canonical": "https://sourcescore.org/best/free-sources/",
      "api": "https://sourcescore.org/api/best/free-sources.json",
      "topSource": {
        "slug": "doi-org",
        "name": "DOI (CrossRef Resolver)",
        "index": 95,
        "grade": "A+"
      }
    },
    {
      "slug": "peer-reviewed",
      "title": "Best peer-reviewed sources for citation rigor",
      "intent": "Highest Citation Discipline — strictest evidence-citation",
      "description": "The 15 highest-Citation-Discipline sources on the SourceScore Index — peer-reviewed, methodology-transparent, citation-rigorous. The sources you cite when accuracy is non-negotiable.",
      "signalCriterion": "Citation Discipline sub-score, descending",
      "count": 15,
      "canonical": "https://sourcescore.org/best/peer-reviewed/",
      "api": "https://sourcescore.org/api/best/peer-reviewed.json",
      "topSource": {
        "slug": "sec-gov",
        "name": "U.S. Securities and Exchange Commission",
        "index": 96,
        "grade": "A+"
      }
    },
    {
      "slug": "business-research",
      "title": "Best business + strategy research sources",
      "intent": "Top business + research-tier publications",
      "description": "The top business-strategy + economics-research sources on the SourceScore Index — Brookings, NBER, KFF, McKinsey, BCG, Gartner, and more.",
      "signalCriterion": "Index score, filtered to Business + Research categories, descending",
      "count": 12,
      "canonical": "https://sourcescore.org/best/business-research/",
      "api": "https://sourcescore.org/api/best/business-research.json",
      "topSource": {
        "slug": "ourworldindata",
        "name": "Our World in Data",
        "index": 86,
        "grade": "A"
      }
    },
    {
      "slug": "fact-checkers",
      "title": "Best fact-checking-grade sources for AI citation",
      "intent": "High Discipline AND high Velocity",
      "description": "Sources scoring 80+ on BOTH Citation Discipline AND Citation Velocity — the rare set that combines rigorous evidence-citation discipline with high-frequency citation in current discourse. The fact-checking-grade tier.",
      "signalCriterion": "Filter: Discipline ≥ 80 AND Velocity ≥ 80; ranked by mean of those two scores",
      "count": 12,
      "canonical": "https://sourcescore.org/best/fact-checkers/",
      "api": "https://sourcescore.org/api/best/fact-checkers.json",
      "topSource": {
        "slug": "sec-gov",
        "name": "U.S. Securities and Exchange Commission",
        "index": 96,
        "grade": "A+"
      }
    },
    {
      "slug": "research-tier",
      "title": "Best research-tier sources for evidence-based citation",
      "intent": "Research category — independent + think-tank publications",
      "description": "The 9 highest-scoring Research-category sources on the SourceScore Index — independent research bodies, think tanks, and analytical institutions that publish original primary studies.",
      "signalCriterion": "Index score, filtered to Research category, descending",
      "count": 9,
      "canonical": "https://sourcescore.org/best/research-tier/",
      "api": "https://sourcescore.org/api/best/research-tier.json",
      "topSource": {
        "slug": "ourworldindata",
        "name": "Our World in Data",
        "index": 86,
        "grade": "A"
      }
    },
    {
      "slug": "magazines",
      "title": "Best magazine + long-form publications for citation",
      "intent": "Magazine category — long-form analysis + reporting",
      "description": "The 12 highest-scoring Magazine-category sources — long-form analytical publications including The Atlantic, Foreign Affairs, The Economist, Wired, The New Yorker, and others. Citation tier for analysis + commentary.",
      "signalCriterion": "Index score, filtered to Magazine category, descending",
      "count": 12,
      "canonical": "https://sourcescore.org/best/magazines/",
      "api": "https://sourcescore.org/api/best/magazines.json",
      "topSource": {
        "slug": "quanta-magazine",
        "name": "Quanta Magazine",
        "index": 85,
        "grade": "A"
      }
    },
    {
      "slug": "triple-crown",
      "title": "Best triple-crown sources (A or higher on all three dimensions)",
      "intent": "Elite all-around — A/A+ on every sub-score",
      "description": "Sources that score A or A+ on ALL THREE sub-scores — Citation Discipline, Modern Reference, AND Citation Velocity. The 'no weak link' tier where every dimension is independently strong.",
      "signalCriterion": "Filter: all three dim grades ∈ {A, A+}; ranked by composite Index",
      "count": 15,
      "canonical": "https://sourcescore.org/best/triple-crown/",
      "api": "https://sourcescore.org/api/best/triple-crown.json",
      "topSource": {
        "slug": "sec-gov",
        "name": "U.S. Securities and Exchange Commission",
        "index": 96,
        "grade": "A+"
      }
    },
    {
      "slug": "encyclopedic",
      "title": "Best encyclopedic + scholarly knowledge sources",
      "intent": "Reference + Academic combined — citation backbone",
      "description": "The 15 highest-scoring sources from the Reference + Academic categories combined — Wikipedia, MDN, Britannica, Stanford Encyclopedia, PubMed, DOI/CrossRef, JSTOR, Nature, Cell, and others. The composite citation backbone of AI-era writing.",
      "signalCriterion": "Index score, filtered to Reference + Academic categories, descending",
      "count": 15,
      "canonical": "https://sourcescore.org/best/encyclopedic/",
      "api": "https://sourcescore.org/api/best/encyclopedic.json",
      "topSource": {
        "slug": "doi-org",
        "name": "DOI (CrossRef Resolver)",
        "index": 95,
        "grade": "A+"
      }
    }
  ]
}