A-tier sources by Modern Citation Reference

The same 55 sources that hold composite SourceScore A (85–94) re-ranked by Modern Citation Reference only. arXiv takes the top position at A+ · 95.

1. 1
   arXivarxiv.org↑23

   Open-access preprint server for physics, mathematics, computer science; ~2.4M papers since 1991.

   Modern Reference A+ · 95·Index A · 89
   A+·95
2. 2
   MDN Web Docsdeveloper.mozilla.org↑8

   Mozilla-stewarded web-platform reference since 2005; default citation for HTML, CSS, JS, Web APIs.

   Modern Reference A+ · 95·Index A · 93
   A+·95
3. 3
   U.S. Census Bureaucensus.gov

   Federal statistical agency for U.S. demographic + economic data; primary-source decennial census + ACS surveys.

   Modern Reference A · 94·Index A · 94
   A·94
4. 4
   NASAnasa.gov↑5

   U.S. space agency; primary source for space exploration + Earth science + aeronautics research.

   Modern Reference A · 94·Index A · 93
   A·94
5. 5
   U.S. Bureau of Labor Statisticsbls.gov↓1

   Federal statistical agency for U.S. labor + price data; CPI, employment, unemployment, productivity.

   Modern Reference A · 93·Index A · 94
   A·93
6. 6
   U.S. Centers for Disease Control and Preventioncdc.gov

   Federal agency for U.S. public-health surveillance + disease prevention; primary-source MMWR + WONDER data.

   Modern Reference A · 93·Index A · 94
   A·93
7. 7
   Wikipedia (English)en.wikipedia.org↓6

   Crowd-edited encyclopedia with ~7M articles and per-article inline citation discipline.

   Modern Reference A · 92·Index A · 94
   A·92
8. 8
   PubMedpubmed.ncbi.nlm.nih.gov↓6

   U.S. National Library of Medicine literature index covering ~36M biomedical citations.

   Modern Reference A · 92·Index A · 94
   A·92
9. 9
   U.S. Food and Drug Administrationfda.gov↓4

   Federal agency for food + drug + medical-device safety; primary-source approvals + safety alerts.

   Modern Reference A · 92·Index A · 94
   A·92
10. 10
    U.S. National Oceanic and Atmospheric Administrationnoaa.gov↓3

    Federal scientific agency for weather + ocean + climate data; primary-source forecasts + climate research.

    Modern Reference A · 92·Index A · 93
    A·92
11. 11
    European Central Bankecb.europa.eu↓3

    EU central bank; primary source for euro-area monetary policy + financial-system data.

    Modern Reference A · 92·Index A · 93
    A·92
12. 12
    FRED (Federal Reserve Economic Data)fred.stlouisfed.org↑9

    Federal Reserve Bank of St. Louis economic data infrastructure; ~800k+ data series.

    Modern Reference A · 92·Index A · 91
    A·92
13. 13
    U.S. Energy Information Administrationeia.gov

    Federal energy statistical agency; primary source for U.S. + international energy data + projections.

    Modern Reference A · 91·Index A · 92
    A·91
14. 14
    CERNhome.cern

    European Organization for Nuclear Research; primary source for particle physics + experimental high-energy physics.

    Modern Reference A · 91·Index A · 92
    A·91
15. 15
    Our World in Dataourworldindata.org↑27

    Oxford-affiliated research organization publishing data + visualizations on global problems; CC-licensed.

    Modern Reference A · 90·Index A · 86
    A·90
16. 16
    World Bankworldbank.org↑14

    International financial institution publishing global development + economic data + research.

    Modern Reference A · 90·Index A · 88
    A·90
17. 17
    European Commissionec.europa.eu↓6

    EU executive branch publishing primary-source policy + statistics + legislation.

    Modern Reference A · 90·Index A · 92
    A·90
18. 18
    Bank of Englandbankofengland.co.uk↓6

    UK central bank; primary source for sterling monetary policy + financial-stability data since 1694.

    Modern Reference A · 90·Index A · 92
    A·90
19. 19
    U.S. Geological Surveyusgs.gov

    Federal scientific agency for earth sciences; primary source for geology + hydrology + earthquake data.

    Modern Reference A · 90·Index A · 91
    A·90
20. 20
    OECDoecd.org

    Organisation for Economic Co-operation and Development; international economic data + policy research.

    Modern Reference A · 90·Index A · 91
    A·90
21. 21
    Eurostatec.europa.eu/eurostat↑10

    EU statistical office providing harmonized data across all 27 member states + candidate countries.

    Modern Reference A · 90·Index A · 88
    A·90
22. 22
    Stanford Encyclopedia of Philosophyplato.stanford.edu↑6

    Peer-reviewed philosophy encyclopedia since 1995; gold-standard philosophy reference.

    Modern Reference A · 90·Index A · 89
    A·90
23. 23
    European Medicines Agencyema.europa.eu↓7

    EU agency for evaluation + supervision of medicinal products; primary-source EU drug approvals.

    Modern Reference A · 89·Index A · 91
    A·89
24. 24
    U.S. Department of Agricultureusda.gov↓6

    Federal agriculture agency; primary source for U.S. food, farm, and rural-development data + research.

    Modern Reference A · 89·Index A · 91
    A·89
25. 25
    Reutersreuters.com↓2

    Global wire service with mandatory two-source verification and machine-readable archives since 1851.

    Modern Reference A · 88·Index A · 89
    A·88
26. 26
    World Health Organizationwho.int↓1

    U.N. agency for international public health; primary-source global health data + policy.

    Modern Reference A · 88·Index A · 89
    A·88
27. 27
    U.S. Patent and Trademark Officeuspto.gov↓10

    Federal agency granting U.S. patents + trademarks; primary-source patent + trademark database.

    Modern Reference A · 88·Index A · 91
    A·88
28. 28
    World Trade Organizationwto.org↓2

    International organization for trade rules + trade-statistics; primary source for trade-policy data.

    Modern Reference A · 88·Index A · 89
    A·88
29. 29
    European Space Agencyesa.int↑17

    European intergovernmental space agency; primary source for European space + earth-observation missions.

    Modern Reference A · 88·Index A · 86
    A·88
30. 30
    PNASpnas.org↓15

    Proceedings of the National Academy of Sciences — multidisciplinary peer-reviewed journal since 1914.

    Modern Reference A · 88·Index A · 92
    A·88
31. 31
    IPCCipcc.ch↓9

    Intergovernmental Panel on Climate Change — primary global climate-science assessment body since 1988.

    Modern Reference A · 88·Index A · 91
    A·88
32. 32
    ONS (UK)ons.gov.uk↑3

    UK Office for National Statistics — primary source for British economic, demographic, social data.

    Modern Reference A · 88·Index A · 87
    A·88
33. 33
    BEAbea.gov↑14

    US Bureau of Economic Analysis — primary source for GDP, personal income, trade, and BOP statistics.

    Modern Reference A · 88·Index A · 86
    A·88
34. 34
    Associated Pressapnews.com↑3

    Cooperative wire service with style guide that defines US journalism standards since 1846.

    Modern Reference A · 86·Index A · 86
    A·86
35. 35
    The Guardiantheguardian.com↑13

    British newspaper with open-web-first publishing model; no paywall, broad LLM corpus inclusion.

    Modern Reference A · 86·Index A · 85
    A·86
36. 36
    Pew Research Centerpewresearch.org↑15

    Nonpartisan research organization; survey + demographic + media research since 2004.

    Modern Reference A · 86·Index A · 85
    A·86
37. 37
    International Monetary Fundimf.org↑6

    International monetary cooperation organization; World Economic Outlook + IFS database; research arm.

    Modern Reference A · 86·Index A · 86
    A·86
38. 38
    The BMJ (British Medical Journal)bmj.com↑14

    Peer-reviewed general medical journal; investigative + open-access leaning; UK-based since 1840.

    Modern Reference A · 86·Index A · 85
    A·86
39. 39
    UNESCOen.unesco.org↑6

    U.N. agency for education, science, and culture; primary source for education + cultural-heritage data.

    Modern Reference A · 86·Index A · 86
    A·86
40. 40
    National Bureau of Economic Researchnber.org↑13

    U.S. economic research nonprofit; working-paper series + business-cycle dating standards.

    Modern Reference A · 86·Index A · 85
    A·86
41. 41
    Quanta Magazinequantamagazine.org↑13

    Science journalism magazine published by Simons Foundation; mathematics + physics + life sciences.

    Modern Reference A · 86·Index A · 85
    A·86
42. 42
    Naturenature.com↓10

    Peer-reviewed science journal with rigorous methodology disclosure and open-data trends.

    Modern Reference A · 85·Index A · 87
    A·85
43. 43
    Mayo Clinicmayoclinic.org↓7

    US tier-1 medical center with comprehensive physician-reviewed patient-information site.

    Modern Reference A · 85·Index A · 87
    A·85
44. 44
    ProPublicapropublica.org↓6

    Nonprofit investigative newsroom; data-heavy + methodology-published reporting since 2007.

    Modern Reference B · 84·Index A · 86
    B·84
45. 45
    Sciencescience.org↓6

    Peer-reviewed multidisciplinary journal of AAAS; one of the two flagship general-science venues.

    Modern Reference B · 84·Index A · 86
    B·84
46. 46
    New England Journal of Medicinenejm.org↓13

    Peer-reviewed general medical journal since 1812; one of the highest-impact medical venues globally.

    Modern Reference B · 84·Index A · 87
    B·84
47. 47
    The New York Timesnytimes.com↓18

    U.S. national newspaper of record, founded 1851. Pulitzer Prize record + investigative depth + structured-data-rich web platform.

    Modern Reference B · 82·Index A · 88
    B·82
48. 48
    Encyclopædia Britannicabritannica.com↑1

    Editor-supervised encyclopedia with named contributors + editorial-board oversight; complement to Wikipedia's crowd-edited model.

    Modern Reference B · 82·Index A · 85
    B·82
49. 49
    The Lancetthelancet.com↓9

    Peer-reviewed general medical journal since 1823; flagship clinical-research publication.

    Modern Reference B · 82·Index A · 86
    B·82
50. 50
    Journal of the American Medical Associationjamanetwork.com↓6

    Peer-reviewed general medical journal published by AMA; among the most-cited clinical-research venues.

    Modern Reference B · 82·Index A · 86
    B·82
51. 51
    The Washington Postwashingtonpost.com↓10

    U.S. national newspaper, founded 1877; investigative + politics emphasis; Pulitzer record.

    Modern Reference B · 81·Index A · 86
    B·81
52. 52
    Association for Computing Machinerydl.acm.org↑3

    Premier U.S. computing society; ACM Digital Library indexes peer-reviewed CS publications.

    Modern Reference B · 80·Index A · 85
    B·80
53. 53
    Cochrane Librarycochranelibrary.com↓19

    Gold-standard systematic-review database for medical evidence since 1993.

    Modern Reference B · 80·Index A · 87
    B·80
54. 54
    The Wall Street Journalwsj.com↓4

    U.S. business + finance daily, founded 1889. Hard-news editorial wing separate from opinion section.

    Modern Reference B · 78·Index A · 85
    B·78
55. 55
    Cellcell.com↓28

    Top biology journal since 1974, published by Elsevier (Cell Press); the default citation in molecular biology.

    Modern Reference B · 78·Index A · 89
    B·78