Reference Sources
Trusted public databases, encyclopedias, and research institutions. Click any source to visit directly.
49 sources
CIA World Factbook
Profiles of countries, territories, and dependencies worldwide.
Encyclopedia Britannica
Authoritative encyclopedia with expert-reviewed articles.
Library of Congress
The largest library in the world, with vast historical collections.
National Archives
U.S. government records, founding documents, and historical archives.
Smithsonian Institution
Museums, research centers, and educational resources.
U.S. Census Bureau
Demographic, economic, and social data for the United States.
Bureau of Labor Statistics
Labor economics, employment, and inflation data.
FedStats
Federal statistics from over 100 agencies.
Fact Monster
Almanac, dictionary, encyclopedia, and homework help.
Infoplease Almanac
Almanac, atlas, dictionary, and encyclopedia.
Internet Public Library
Curated online resources by subject and format.
Gallup
Public opinion polls and analytics.
Hoover's Business Research
Company profiles and business intelligence.
CNN Student News
Current events and news for students.
Convert-Me
Online conversion calculators for units and measurements.
eLibrary
Digital research library with articles and publications.
iTools Research
Search tools and research utilities aggregator.
PubMed
Biomedical literature from MEDLINE and life science journals.
Google Scholar
Search across scholarly literature and citations.
JSTOR
Academic journals, books, and primary sources.
ERIC
Education Resources Information Center database.
arXiv
Open-access preprints in physics, math, CS, and more.
SSRN
Social Science Research Network preprints.
DOAJ
Directory of Open Access Journals.
NIH
National Institutes of Health — medical research.
CDC
Centers for Disease Control and Prevention.
NASA
Space, aeronautics, and science data and imagery.
NOAA
Weather, climate, and ocean data.
NSF
National Science Foundation research funding and data.
Data.gov
U.S. government open data portal.
United Nations
UN data, documents, and international statistics.
UNESCO
Education, science, and culture data.
WHO
World Health Organization — global health data.
OECD
Economic and social policy data.
IMF
International Monetary Fund data and reports.
World Bank
Global development data and indicators.
Cornell LII
Cornell Legal Information Institute — law and legal resources.
Supreme Court
U.S. Supreme Court opinions and filings.
Federal Register
Daily journal of the U.S. federal government.
SEC EDGAR
Corporate filings and financial data.
BEA
Bureau of Economic Analysis — GDP and economic accounts.
APA
American Psychological Association resources.
NIMH
National Institute of Mental Health.
Khan Academy
Free educational lessons across subjects.
OpenStax
Free, peer-reviewed textbooks.
MIT OCW
MIT OpenCourseWare — free course materials.
W3C
World Wide Web Consortium standards.
MDN Web Docs
Web development documentation and references.
NIST
National Institute of Standards and Technology.
