APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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