Cita APA (7a ed.)

BABBIE, E. (1983). The practice of social research.-- ed.3. Wadsworth.

Cita Chicago Style (17a ed.)

BABBIE, Earl. The Practice of Social Research.-- Ed.3. California: Wadsworth, 1983.

Cita MLA (9a ed.)

BABBIE, Earl. The Practice of Social Research.-- Ed.3. Wadsworth, 1983.