Cita APA (7a ed.)

Groos, K., Baldwin, E. L., & Baldwin, J. M. (1914). The play of man. D. Appleton and Company.

Cita Chicago Style (17a ed.)

Groos, Karl, Elizabeth L. Baldwin, y James Mark Baldwin. The Play of Man. New York ; London: D. Appleton and Company, 1914.

Cita MLA (9a ed.)

Groos, Karl, et al. The Play of Man. D. Appleton and Company, 1914.