Whitewater Rescue Manual: New Techniques for Canoeists, Kayakers, and Rafters
by Charles Walbridge and Wayne A. Sundmacher
This is the best available, but then I am biased. I took my training from the authors. The one below is also good, but spends far too much time on technical rescues I have never seen, let alone used. In whitewater rescues, speed is the essence!