KERLINGER, F. N. (2000). Foundations of behavioral research. Harcourt College.
Lua i Stíl Chicago (17ú heag.)KERLINGER, Fred N. Foundations of Behavioral Research. Harcourt College, 2000.
Lua MLA (8ú heag.)KERLINGER, Fred N. Foundations of Behavioral Research. Harcourt College, 2000.
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