All About Budgerigars, Comprehensive Treatise on Housing,Management Breeding & Exhibiting by Frank W Pratley Pub. Cage Birds. VGC 114 pages. Really useful vintage book on the care of Budgerigars. http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=220213193189&ssPageName=STRK:MESE:IT