Cita APA (7a ed.)

Bierhoff, H. (1991). Attribution of responsibility and helpfulness. Altruism in social systems, 106-129.

Cita Chicago Style (17a ed.)

Bierhoff, Hans-Werner. "Attribution of Responsibility and Helpfulness." Altruism in Social Systems 1991: 106-129.

Cita MLA (9a ed.)

Bierhoff, Hans-Werner. "Attribution of Responsibility and Helpfulness." Altruism in Social Systems, 1991, pp. 106-129.