APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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