Gaya APA

Zikmund, G, W. (2013). Essentials of marketing research : ED-5th (ED-5th). China: China : South-Western, 2013.

Gaya MLA

Zikmund, G., William. "Essentials of marketing research : ED-5th". ED-5th China: China : South-Western, 2013, 2013. Text.