APA (7th ed.) Citation

Smith, P. K. (1984). Play in animals and humans. B. Blackwell.

Chicago Style (17th ed.) Citation

Smith, Peter K. Play in Animals and Humans. [Oxford, England] ; [New York, N.Y. USA]: B. Blackwell, 1984.

MLA (9th ed.) Citation

Smith, Peter K. Play in Animals and Humans. B. Blackwell, 1984.