Cozby, P. C. (2005). Methods in behavioral reseachPaul C. Cozby. MC GRAW HILL.
Lua i Stíl Chicago (17ú heag.)Cozby, Paul C. Methods in Behavioral ReseachPaul C. Cozby. MC GRAW HILL, 2005.
Lua MLA (8ú heag.)Cozby, Paul C. Methods in Behavioral ReseachPaul C. Cozby. MC GRAW HILL, 2005.
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