Gaya APA

Perreault, W, D. et al (c2012). Essentials of marketing: a marketing strategy planning approach (13th ed.). : McGraw-Hill/Irwin.

Gaya MLA

Perreault, William, D.. et al. "Essentials of marketing: a marketing strategy planning approach". 13th ed. : McGraw-Hill/Irwin, c2012. .