Dyfyniad APA

Kotler, P. (1991). Principles of marketing (5th.). Prentice Hall.

Dyfyniad Arddull Chicago

Kotler, Philip. Principles of Marketing. 5th. New Delhi: Prentice Hall, 1991.

Dyfyniad MLA

Kotler, Philip. Principles of Marketing. 5th. Prentice Hall, 1991.

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