Those are great but I like the "Sport Riding Techniques" book even better. Keith code likes to come up with his own terminology and catch phrases. Nick Ienatsch's The Cornering Bible is in plain English and, I think, does much better job of offering real world examples for street and track.
I say get them all!
[ame=http://www.amazon.com/Sport-Riding-Techniques-Develop-Confidence/dp/1893618072]Amazon.com: Sport Riding Techniques: How To Develop Real World Skills for Speed, Safety, and Confidence on the Street and Track (9781893618077): Nick Ienatsch, Kenny Roberts: Books[/ame]
This is one of the best, IMHO. I have had this book forever. I beleve it is a first edition printing as well. This is photo is a stock photo, not my actual copy, but I'm at work right now. But my copy is in very, very good condition. I have read the book multiple times over the years.