Reference
Britannica
A trusted source of information and educational content.
CiteSeerX
A public search engine and digital library for scientific literature.
Google Scholar
A freely accessible web search engine for scholarly literature.
JSTOR
A digital library for academic journals, books, and primary sources.
Open Library
An open, editable library catalog with millions of books.
PubMed
A free search engine accessing primarily the MEDLINE database of references.
Quora
A platform where users can ask questions and share knowledge.
ResearchGate
A social networking site for scientists and researchers to share papers.
Wikipedia
A free online encyclopedia with articles written by volunteers.
WorldCat
A global catalog of library collections.
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