I have and use The Cyclists Training Bible, by Joe Friel, the roadie equivalent to the book you have. He also has a presence at Ultrafit.com. (The e-tips always have some good information.) I like his approach to coaching... not as clinical as Carmichael. I don't feel like he's ignoring the person in favor of a page of numbers. Just my impression. Getting back to the question, I think it's the best book out there on planning and developing your own training program. On the other hand, while the information on the workouts themselves is good, I think there are better sources for that.

FWIW, I tend to agree with the Velocipedio and Nathank. You've "ball-parked" your AT with a time trial. If you're sensitive to it while doing hard rides and intervals, it's my opinion that you develop a pretty good feel for what it is. Certainly close enough to target your workout efforts. I also agree with Koffee, you need to be sensitive to changes, and adjust your efforts accordingly.