These are the books I have currently ...
The Budgerigar ~ by Dr. Rob Marshall (exxie at $114 - but it's a BIG book, full of info)
Best in Show - Breeding and Exhibiting Budgerigars ~ by Gerald S. Binks (very interesting info!)
Budgerigars in Colour - Their Care and Breeding ~ by A. Rutgers, edited by Cyril Rogers (loving the colour plates in this one!
The Complete Book of Budgerigars ~ by John Scoble
Budgerigars - BEST FRIEND or NATIONAL CHAMPION ~ by Judy Higgins & Betty Rea
Budgerigar - Understanding and Caring for your Pet ~ by Catherine Smith
When I've read through them a few times, hopefully I'll have absorbed *something*!