Cita APA (7a ed.)

Burton, M. (1973). The observer's book of wild animals. F. Warne.

Cita Chicago Style (17a ed.)

Burton, Maurice. The Observer's Book of Wild Animals. London: F. Warne, 1973.

Cita MLA (9a ed.)

Burton, Maurice. The Observer's Book of Wild Animals. F. Warne, 1973.