APA (7th ed.) Citation

Keen, M. L. (1962). The how and why wonder book of wild animals. Grosset & Dunlap.

Chicago Style (17th ed.) Citation

Keen, Martin L. The How and Why Wonder Book of Wild Animals. New York: Grosset & Dunlap, 1962.

MLA (9th ed.) Citation

Keen, Martin L. The How and Why Wonder Book of Wild Animals. Grosset & Dunlap, 1962.