Gaya APA

ZIKMUND, W, G., Babin, B, J. (2013). BUSINESS RESEARCH METHODS (9th). Australia: SOUTH-WESTERN CENGAGE LEARNING.

Gaya MLA

ZIKMUND, William, G.., Babin, Barry, J.. "BUSINESS RESEARCH METHODS". 9th Australia: SOUTH-WESTERN CENGAGE LEARNING, 2013. Text.