Gaya APA

Zikmund, W, G., D`amico, M. (2002). The power of effective marketing : creating and keeping customers in an e-commerce world (3). United Kingdom: South-Western Thomson Learning.

Gaya MLA

Zikmund, William, G., D`amico, Michael. "The power of effective marketing : creating and keeping customers in an e-commerce world". 3 United Kingdom: South-Western Thomson Learning, 2002. Text.