Cita APA

Babbie, E. R. (2013). The practice of social research (13th ed.). Wadsworth Cengage Learning.

Citación estilo Chicago

Babbie, Earl R. The Practice of Social Research. 13th ed. Belmont, Calif.: Wadsworth Cengage Learning, 2013.

Cita MLA

Babbie, Earl R. The Practice of Social Research. 13th ed. Wadsworth Cengage Learning, 2013.