A very thorough list of reference sources in philosophy, both online and traditional print sources.

Loads of links to many online electronic text sites.

Excellent source of electronic texts.  Good search engine.

Excellent links to electronic philosophy texts from all time periods:  Antiquiry, Medieval, 17th Century, 18th

Century, 19th Century, and 20th Century.  (Sorry, no 21st Century sources available yet.  Check back in about

fifty years!)

   

Many virtual library links to many different sites, including many university sites.