Gaya APA

GRAVETTER, F, J., FORZANO, L, B. (2012). Research methods for the behavioral sciences (4th ed.). Australia: Wadsworth.

Gaya MLA

GRAVETTER, Frederick, J.., FORZANO, Lori-Ann, B.. "Research methods for the behavioral sciences". 4th ed. Australia: Wadsworth, 2012. Buku.