KERLINGER, F. N. Foundations of behavioral research.-- ed.2. Holt.
Lua i Stíl Chicago (17ú heag.)KERLINGER, Fred N. Foundations of Behavioral Research.-- Ed.2. New York: Holt.
Lua MLA (9ú heag.)KERLINGER, Fred N. Foundations of Behavioral Research.-- Ed.2. Holt.
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