Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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