Cita APA (7th ed.)

Babbie, E. R. (1979). The practice of social research (2nd. ed.). Wadsworth.

Cita Chicago (17th ed.)

Babbie, Earl R. The Practice of Social Research. 2nd. ed. Carlifornia: Wadsworth, 1979.

Cita MLA (9th ed.)

Babbie, Earl R. The Practice of Social Research. 2nd. ed. Wadsworth, 1979.