Dyfyniad APA

Kotler, P., & Armstrong, G. (1997). Marketing: An introduction (4th ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Kotler, Philip, and Gary Armstrong. Marketing: An Introduction. 4th ed. New Jersey: Prentice Hall, 1997.

Dyfyniad MLA

Kotler, Philip, and Gary Armstrong. Marketing: An Introduction. 4th ed. Prentice Hall, 1997.

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