Philosopher's Index is the premier database for scholarly research in all areas of philosophy.

Significantly-enhanced full text of works by every major philosopher.

PhilPapers is a comprehensive index and bibliography of philosophy maintained by the community of philosophers. They monitor all sources of research content in philosophy, including journals, books, and open access archives. They also host the largest open access archive in philosophy.

Use the search box that says "Search Cambridge Companions", not the search box at the top

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Complete text of over 1,800 Oxford books including Philosophy titles.

Covers all aspects of Islam and the Muslim world

L'Annèe Philologique indexes publications about ancient philosophers