APA (7th ed.) Zitazioa
Leedy, P. D. (1980). Practical research: Planning and Desgn (2nd ed.). Macmillan.
Chicago Style (17th ed.) Zitazioa
Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. New York: Macmillan, 1980.
MLA (9th ed.) Zitazioa
Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. Macmillan, 1980.
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