APA (7e ed.) Bronvermelding

Babbie, E. (1992). The practice of social research (6th ed.). Wadsworth.

Chicago (17e ed.) Bronvermelding

Babbie, Earl. The Practice of Social Research. 6th ed. California: Wadsworth, 1992.

MLA (9e ed.) Bronvermelding

Babbie, Earl. The Practice of Social Research. 6th ed. Wadsworth, 1992.