My favorite is one I found at the library and liked so much I bought a copy. The Sweater Workshop by Jacqueline Fee. It focuses on knitting in the round and explains how to design your own sweaters and gives the formulas for figuring out stitch count accounting for needle size and yarn used and your knitting gauge. I photocopied the worksheet about 20 times and keep them ready for my next sweater project. There's a place on the sheet to write down yarn used and needle size so you can keep it for future reference.
"Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it's the only thing that ever has."--Margaret Mead