APA (7th ed.) Citation

Derlega, V. J., & Grzelak, J. (1982). Cooperation and helping behavior: Theories and research. Acad. Pr.

Chicago Style (17th ed.) Citation

Derlega, Valerian J., and Janusz Grzelak. Cooperation and Helping Behavior: Theories and Research. New York [u.a.]: Acad. Pr, 1982.

MLA (8th ed.) Citation

Derlega, Valerian J., and Janusz Grzelak. Cooperation and Helping Behavior: Theories and Research. Acad. Pr, 1982.