Dyfyniad APA

Kotler,Philip, & Armstrong, G. (2008). Principles of marketing (12nd ed.). Pearson Education.

Dyfyniad Arddull Chicago

Kotler,Philip, and Gray Armstrong. Principles of Marketing. 12nd ed. New Delhi: Pearson Education, 2008.

Dyfyniad MLA

Kotler,Philip, and Gray Armstrong. Principles of Marketing. 12nd ed. Pearson Education, 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.