Lua APA (7ú heag.)

Leedy, P. D., & Ormrod, J. E. (2005). Practical research: Planning and design (8th ed.). Prentice Hall.

Lua i Stíl Chicago (17ú heag.)

Leedy, Paul D., agus Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8th ed. Upper Saddle River, N.J.: Prentice Hall, 2005.

Lua MLA (8ú heag.)

Leedy, Paul D., agus Jeanne Ellis Ormrod. Practical Research: Planning and Design. 8th ed. Prentice Hall, 2005.

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