The Internet Encyclopedia of Philosophy / Edited by James Fieser. Martin, TN. : University of Tennessee at Martin, 1997. https://www.iep.utm.edu/
Articles in the Internet Encyclopedia of Philosophy are currently from three sources (1) adaptations from public domain sources, (2) adaptations of material written by the editor for classroom purposes, and (3) original contributions by professional philosophers around the internet. Over time, the editor seeks to replace all of the first two types of articles with original contributions by professional philosophers.
Stanford Encyclopedia of Philosophy / Edited by Edward N. Zalta. Palo Alto, CA. : Stanford University Center for the Study of Language and Information, 1997.http://plato.stanford.edu/
This Web encyclopedia constantly changes with the addition of new entries and the modification of existing entries. Consequently, you can expect the entries in this encyclopedia to be responsive to new research. The entries are evaluated by an Editorial Board.