Cita APA (7a ed.)

Nietzel, M. T., & Ullmann, L. P. (1977). Behavioral approaches to community psychology. Pergamon.

Cita Chicago Style (17a ed.)

Nietzel, Michael T., y Leonard P. Ullmann. Behavioral Approaches to Community Psychology. New York [etc.]: Pergamon, 1977.

Cita MLA (9a ed.)

Nietzel, Michael T., y Leonard P. Ullmann. Behavioral Approaches to Community Psychology. Pergamon, 1977.