APA (7th ed.) Citation

Forshaw, J. M., & Cooper, W. T. (1973). Parrots of the world. Doubleday.

Chicago Style (17th ed.) Citation

Forshaw, Joseph Michael, and William T. Cooper. Parrots of the World. Garden City, N.Y.: Doubleday, 1973.

MLA (9th ed.) Citation

Forshaw, Joseph Michael, and William T. Cooper. Parrots of the World. Doubleday, 1973.