References
Budgerigar specimen (Melopsittacus undulatus), photographed under UV light © Natural History Museum, London
Collar, N 1997. Family Psittacidae (Parrots). In: del Hoyo, J et al (eds.) Handbook of the Birds of the World, Vol. 4 Sandgrouse to Cuckoos. Lynx Edicions, Barcelona: 280–477.
Birkhead, T, Schulze-Hagen, K and Palfner, G (2003). The colour of birds: Hans Duncker, pioneer bird geneticist. Journal fiir Ornithologie, 144: 253–270.
Elliot, FS and Brooks, EW (1999). Budgerigar Matings and Colour Expectations (11th edition, revised). The Budgerigar Society, Northampton.
Fisher, CT and Warr, FE (2003). Museums on paper: library and manuscript resources. Bulletin of the British Ornithologists’ Club, 123A: 136–164.
Gould, J 1840-1848. Birds of Australia, Vols. 1-7. (Budgerigar appears in Vol. 5, plate 44).
Rogers, CH and Blake, J (2001). World of Budgerigars (5th edition, revised). Northbrook Publishing Ltd., West Sussex.
Taylor, TG and Warner, C (1986). Genetics for Budgerigar Breeders (2nd edition). The Budgerigar Society, Northampton.
