Citazione Stile APA (7a Edizione)

Leedy, P. D. (1980). Practical research: Planning and Desgn (2nd ed.). Macmillan.

Citazione stile Chigago Style (17a edizione)

Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. New York: Macmillan, 1980.

Citatione MLA (9a ed.)

Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. Macmillan, 1980.