APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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