APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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