Extensive collection of reference material. Many colleges provide this service free to their students.
Search for scholarly literature: research papers, theses, books, articles and more.
Computational knowledge search engine. Useful for stats help and finding obscure info.
Internet Public Library
Extensive collection of reference material. Includes special collections and "Ask a Librarian" sections.
Links to more than 10,000 libraries worldwide. Download research tools to your computer or phone.
Highly useful literature guides. Also features study guides and discussion forums.
Reference, facts, news and tools
for research papers.
Encyclopedias, biographies, topic search, language help, map tools, search tools.
Find out how to pronounce just about any word in any language.
Homework help that includes a 24/7 "Ask an Expert" service.