As the author / contributor of the two books quoted earlier, the question I would have is 'What do you want to know?'
Most of the books on automatic flight control systems concentrate on the design / engineering aspects, and precious few (read none) on the actual piloting aspects.
So, if you want to know more about the engineering aspects, look at the texts, but if you want to know how to use them, not much out there will help.
But what do you really want to know?