APA (7th ed.) Citation

Reilly, P. N. (1994). Penguins of the world. Oxford University Press.

Chicago Style (17th ed.) Citation

Reilly, P. N. Penguins of the World. Oxford ; New York: Oxford University Press, 1994.

MLA (9th ed.) Citation

Reilly, P. N. Penguins of the World. Oxford University Press, 1994.