APA (7th ed.) Citation

Cayley, N. W., & Roberts, P. (1973). What bird is that?: A guide to the birds of Australia (Abridged ed.). Angus & Robertson.

Chicago Style (17th ed.) Citation

Cayley, Neville William., and Peter Roberts. What Bird Is That?: A Guide to the Birds of Australia. Abridged ed. London: Angus & Robertson, 1973.

MLA (9th ed.) Citation

Cayley, Neville William., and Peter Roberts. What Bird Is That?: A Guide to the Birds of Australia. Abridged ed. Angus & Robertson, 1973.