APA

Schroeder D. A., Penner L. A., Dovidio J. F. & Piliavin J. A. (1995). The Psychology of Helping and Altruism : Problems and Puzzles. New York: McGraw Hill , Inc.

Chicago

Schroeder David A, Penner Louis A, Dovidio John F and Piliavin Jane A. 1995. The Psychology of Helping and Altruism : Problems and Puzzles. New York: McGraw Hill , Inc.

Harvard

Schroeder D. A., Penner L. A., Dovidio J. F. and Piliavin J. A. (1995). The Psychology of Helping and Altruism : Problems and Puzzles. New York: McGraw Hill , Inc.

MLA

Schroeder David A, Penner Louis A, Dovidio John F and Piliavin Jane A. The Psychology of Helping and Altruism : Problems and Puzzles. New York: McGraw Hill , Inc. 1995.