Citazione Stile APA (7a Edizione)

Leedy, P. D. (1992). Practical research planning and desing (5a. ed.). MacMillan.

Citazione stile Chigago Style (17a edizione)

Leedy, Paul D. Practical Research Planning and Desing. 5a. ed. Nueva York: MacMillan, 1992.

Citatione MLA (9a ed.)

Leedy, Paul D. Practical Research Planning and Desing. 5a. ed. MacMillan, 1992.