Philosophy: Guides and Encyclopedias
- Cambridge Histories
- Concise Encyclopedia of Western Philosophy
- Encyclopedia of Asian Philosophy
- Oxford Bibliographies Online: Philosophy
- Oxford Companion to Philosophy
- Oxford Dictionary of Philosophy
- Past Masters (primary texts by key figures)
- Philosophy of Science: An Encyclopedia
- Routledge Dictionary of Philosophy
- Stanford Encyclopedia of Philosophy
- University Press Scholarship Online: Philosophy
- Very Short Introductions (overviews of key areas in philosophy, from Oxford)