I've probably got all the aeros book ever written - in several languages!
Cassidy's book is as techie as you need to get of you intend to fly the maneouvers. Muller and Williams are great reads.
Goulian/Svory books are informative.
L'Apparents Freestyle book is available from Diana Britten via the sales and wanted section on
Home page for the BAeA website
Patrick Gigot handwrote a really informative book which was photocopied and was available via the Aeroclube de Caen-Carpiquet. Okay - it's in French however most schools do teach it, so it should not be incomprehensible and the graphics are illuminating.
For me - understanding lift theory, load, drag and 'g' is enough.
Fellow Ppruner Zulu Apha is about to head off behind the Iron Curtain to represent GB at the World Advanced Championships - despite his academic ranking, I doubt he worries about the mechanics of flight, too much!
Just enjoy learning to fly the manouevres perfectly - and all that takes is money!!
Stik