APA (7e ed.) Bronvermelding

Leedy, P. D. (1985). Practical research: Planning and design (3rd ed.). Macmillan.

Chicago (17e ed.) Bronvermelding

Leedy, Paul D. Practical Research: Planning and Design. 3rd ed. New York: Macmillan, 1985.

MLA (9e ed.) Bronvermelding

Leedy, Paul D. Practical Research: Planning and Design. 3rd ed. Macmillan, 1985.