Dyfyniad APA

Etzel, M. J. (2007). Marketing (14th ed.). McGraw-Hill/Irwin.

Dyfyniad Arddull Chicago

Etzel, Michael J. Marketing. 14th ed. Boston ; New Delhi: McGraw-Hill/Irwin, 2007.

Dyfyniad MLA

Etzel, Michael J. Marketing. 14th ed. McGraw-Hill/Irwin, 2007.

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