Gaya APA

Zikmund, W, G., Babin, B, J. (2010). Business Research Methods (Eighth Edition, International Edition). United Kingdom: South Western Cengage Learning.

Gaya MLA

Zikmund, William, G.., Babin, Barry, J.. "Business Research Methods". Eighth Edition, International Edition United Kingdom: South Western Cengage Learning, 2010. Text.