Which sites is the best for finding a person's art information?

Question:

Examples like information about Pablo Picasso and Frank Stella's artwork.

Best Answer - Chosen by Asker:

There are two sites that I like. My very favorite is:Artcyclopedia at:
http://www.artcyclopedia.com/

and the other one is World Wide Artists Resources.
http://wwar.com/artists/