Here is a list of the books I use to find stitches and techniques. I often refer to these books as stitchionaries.
Super Stitches Knitting by Karen Hemingway
Vogue Knitting Stitchionary 2 by Vogue
The Very Easy Guide to Cable Knitting by Lynne Watterson
400 Knitting Stitches by Potter Craft
The Knitting Answer Book by Margaret Radcliffe
A Treasury of Knitting Patterns by Barbara G. Walker
Links to the books on Amazon are created to save you time. I get no compensation for such links.