ScienceDirect (Online service), Derlega, V. J., & Grzelak, J. (1982). Cooperation and helping behavior: Theories and research. Academic Press.
Chicago Style (17th ed.) CitationScienceDirect (Online service), Valerian J. Derlega, and Janusz Grzelak. Cooperation and Helping Behavior: Theories and Research. New York: Academic Press, 1982.
MLA (9th ed.) CitationScienceDirect (Online service), et al. Cooperation and Helping Behavior: Theories and Research. Academic Press, 1982.
Warning: These citations may not always be 100% accurate.