Collar, N. J (1997) Family Psittacidae (Parrots) — In del Hoyo, J., Elliot, A. and Sargatal, J (eds.), Handbook of the Birds of the World, 4 (Sandgrouse to Cuckoos): 280-477. Barcelona (Lynx Edicions). [pour Psittacus intermedia et Trichoglossus haematodus]
Collar, N. J. 1997. Family Psittacidae (Parrots). in del Hoyo, J., Elliot, A. and Sargatal, J. eds. Handbook of the Birds of the World. 4. Sandgrouse to Cuckoos: 280-477: Lynx Edicions, Barcelona (for Psittacus intermedia and Trichoglossus haematodus)