Leary, M. R. (2001). Introduction to behavioral research methods (3rd ed.). Allyn & Bacon.
Lua i Stíl Chicago (17ú heag.)Leary, Mark R. Introduction to Behavioral Research Methods. 3rd ed. Boston: Allyn & Bacon, 2001.
Lua MLA (9ú heag.)Leary, Mark R. Introduction to Behavioral Research Methods. 3rd ed. Allyn & Bacon, 2001.
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