Looking at Paintings: A Guide to Technical Terms, by Tiarna Doherty and Anne T. Woollett. ND31 .C37 2009
The World's Master Paintings, by Christopher Wright. ND40 .W75 1992
Encyclopedia of Painting: Painters and Painting of the World from Prehistoric Times to the Present Day, edited by Bernard S. Myers. ND30 .M98
Journals and E-Journals:
Modern Painters. (1999-present) Focuses on contemporary painters and other visual artists; includes criticism and practices. (Available in print from 1988 to the present--N6480 .M63.)
Watercolor. (1999-present) Includes exhibition reviews, criticism, and study of the techniques of watercolor.
Webpages:
Try this article on painting from the Encyclopedia of Aesthetics at Oxford Art Online--it will point you to many other related articles.
Want to learn how to mix your own oil paints? Try this great video.
Stretching your own canvases instead of buying them ready-made can save you money. Learn how with this article and video.
Would you like to learn how to mat your own paintings? This site explains how to mat watercolors (or drawings).