APA (7e ed.) Bronvermelding

Babbie, E. R. (2021). The practice of social research (15th ed.). Cengage Learning Inc.

Chicago (17e ed.) Bronvermelding

Babbie, Earl R. The Practice of Social Research. 15th ed. USA: Cengage Learning Inc, 2021.

MLA (9e ed.) Bronvermelding

Babbie, Earl R. The Practice of Social Research. 15th ed. Cengage Learning Inc, 2021.