500 Art Quilts published by Lark Crafts: Excellent book for inspiration. Beautiful photos of 500 quilts
Fabric Art workshop by Susan Stein: Many art quilting techniques and materials to explore.
The Complete Photo Guide to Art Quilting by Stein: Detailed instructions for all types of art quilting.
Painting with Fabric by Jeanine Malaney: This is the technique that I use. Great photos and good instructions for this technique.