Stanford Encyclopedia of Philosophy is a reference work on philosophy maintained by Stanford University. Each encyclopedia entry is authored and updated by an expert or group of experts in their field.
Routledge Encyclopedia of Philosophy coverage includes Anglo-American, ethical and political, cross-cultural, interdisciplinary, continental and contemporary philosophy.
International Encyclopedia of the Social and Behavioral Sciences is a source of social and behavioral sciences reference material. It contains articles, bibliographic references as well as comprehensive name and subject indexes.