Dyfyniad APA

Kotler, P., & Armstrong, G. (1991). Principles of marketing (8th ed.). Prentice hall of India.

Dyfyniad Arddull Chicago

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 8th ed. New Delhi: Prentice hall of India, 1991.

Dyfyniad MLA

Kotler, Philip, and Gary Armstrong. Principles of Marketing. 8th ed. Prentice hall of India, 1991.

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