Budgerigar Books?

im just wondering if anyone knows of any good books on budgies that go into genetics and breeding in depth, ive had a look at my local library but it seems the only ones i can find seem to be the ones for first time pet budgies owners and dont really get into the sort of stuff id like to know. i realise that the is alot of great info on here but it would be nice to know of any books that have the sort of info i need and i could just have a read whenevr i need to if this makes sense? so if anyone could help me out by telling my titles and names, authors of any good books that would be awesome!!!!