Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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