APA (7th ed.) Citation

Groos, K., & Baldwin, E. L. (1911). The play of animals. D. Appleton and Company.

Chicago Style (17th ed.) Citation

Groos, Karl, and Elizabeth L. Baldwin. The Play of Animals. New York: D. Appleton and Company, 1911.

MLA (9th ed.) Citation

Groos, Karl, and Elizabeth L. Baldwin. The Play of Animals. D. Appleton and Company, 1911.

Warning: These citations may not always be 100% accurate.