Anything written by cutelilbirdies xD
The old books are still good. I bought one (can't remember what it's called or where it is atm!) and it was fascinating. Most things still applied, and it had a lot of home remedies for problems. So long as you cross check the information, there's nothing wrong with having them on hand for quick reference.
You know you might have too many budgies when you're not sure if you've remembered them all!
Charlie - Cinny - Dante - Gidget - Jimmette - JJ - Jules - Mo - Ollie - Peanut - Penny - Pie - PJ - Pockie - Sally - Simon - Snowy - Song - Sora - Spang - Tommy