Cita APA (7a ed.)

Pettigrew, T. F., & Tropp, L. R. (2011). When groups meet: The dynamics of intergroup contact. Psychology Press.

Cita Chicago Style (17a ed.)

Pettigrew, Thomas F., y Linda R. Tropp. When Groups Meet: The Dynamics of Intergroup Contact. New York: Psychology Press, 2011.

Cita MLA (9a ed.)

Pettigrew, Thomas F., y Linda R. Tropp. When Groups Meet: The Dynamics of Intergroup Contact. Psychology Press, 2011.