Lua APA (7ú heag.)

Leedy, P. D. (2005). Practical researchPaul D.Leedy and Jeanne Ellis Ormrod. Pearson.

Lua i Stíl Chicago (17ú heag.)

Leedy, Paul D. Practical ResearchPaul D.Leedy and Jeanne Ellis Ormrod. Pearson, 2005.

Lua MLA (8ú heag.)

Leedy, Paul D. Practical ResearchPaul D.Leedy and Jeanne Ellis Ormrod. Pearson, 2005.

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