Dyfyniad APA
Kotler, P. (1983). Principles of marketing (2nd ed.). Prentice-Hall.
Dyfyniad Arddull Chicago
Kotler, Philip. Principles of Marketing. 2nd ed. London: Prentice-Hall, 1983.
Dyfyniad MLA
Kotler, Philip. Principles of Marketing. 2nd ed. Prentice-Hall, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.