Cita APA

Bell, R. R., & Bell, R. R. (1981). Contemporary social problems. Homewood, Ill: Dorsey.

Citación estilo Chicago

Bell, Robert R., y Robert R. Bell. Contemporary Social Problems. Homewood, Ill: Dorsey, 1981.

Cita MLA

Bell, Robert R., y Robert R. Bell. Contemporary Social Problems. Homewood, Ill: Dorsey, 1981.