Dyfyniad APA

Kotler, P., & Armstrong, G. (2008). Principles of marketing (12th internationl ed.). Pearson Prentice Hall.

Dyfyniad Arddull Chicago

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 12th internationl ed. New Jersey: Pearson Prentice Hall, 2008.

Dyfyniad MLA

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 12th internationl ed. Pearson Prentice Hall, 2008.

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