Lua APA (7ú heag.)
Leedy, P. D. (1992). Practical research: Planning and design (5th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)
Leedy, Paul D. Practical Research: Planning and Design. 5th ed. New Jersey: Prentice Hall, 1992.
Lua MLA (9ú heag.)
Leedy, Paul D. Practical Research: Planning and Design. 5th ed. Prentice Hall, 1992.
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