Dyfyniad APA
Kerin, R., Hartley, S. W., & Rudelius, W. (2009). Marketing (9th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Kerin, Roger, Steven W. Hartley, and William Rudelius. Marketing. 9th ed. NY: McGraw-Hill, 2009.
Dyfyniad MLA
Kerin, Roger, et al. Marketing. 9th ed. McGraw-Hill, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.