This is an older thread, so not sure if you are still in the market.

I got Swim Workouts for Triathletes with an Amazon gift card that was in my stocking. It is spiral bound and intended for poolside, though I am too paranoid to actually risk getting it wet. I like the book and would recommend it. However.... it is NOT a 'how to swim book,' but is primarily a planning tool to build up workouts.