Gaya APA

Gravetter, F, J., Wallnau, L, B. (2004). Statistics for the Behavioral and Social Sciences 6'th Ed. (6). California: Wadsworth.

Gaya MLA

Gravetter, Frederick, J.., Wallnau, Larry, B.. "Statistics for the Behavioral and Social Sciences 6'th Ed.". 6 California: Wadsworth, 2004. Text.