Gaya APA

Shaughnessy, J, J., Zechmeister, E, B. (1997). Research Methods in Psychology (Edisi :4). Singapura: The McGraw-Hill Companies.

Gaya MLA

Shaughnessy, John, J.., Zechmeister, Eugene, B.. "Research Methods in Psychology". Edisi :4 Singapura: The McGraw-Hill Companies, 1997. Text.