Saya mau tau Rujukan dari Budgerigar. Jelaskan dalam bahasa melayu

Pranty, B. 2001. The Budgerigar in Florida:: Rise and fall of an exotic psittacid. North American Birds 55: 389-397.

Forshaw, Joseph M. & Cooper, William T. (1978): Parrots of the World (2nd ed). Landsdowne Editions, Melbourne Australia ISBN 0-7018-0690-7

Collar, N. J. (1997). Budgerigar (Melopsittacus undulatus). Pg. 384 in: del Hoyo, J., Elliott, A. & Sargatal, J. eds. (1997). Handbook of the Birds of the World. Vol. 4. Sandgrouse to Cuckoos. Lynx Edicions, Barcelona. ISBN 84-87334-22-9