(a) one of the most useful is the Boeing PE's training manual if you can track down a copy
(b) if you know any TPs, try getting copies of some of their school notes
(c) try an internet search - plenty of hits to choose from ..
(d) I like Mair and Birdsall, Miele, Von Mises, Perkins and Hage .. all useful
(e) if you don't like a touch of maths, though, bypass (d) and stick with Hurt (USN textbook with which most pilots are familiar)