Dyfyniad APA
Etzel, M. J., Walker, B. J., & Stanton, W. J. (2004). Marketing (13th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Etzel, Michael J., Bruce J. Walker, and William J. Stanton. Marketing. 13th ed. Boston, Mass. ; New Delhi: McGraw-Hill, 2004.
Dyfyniad MLA
Etzel, Michael J., et al. Marketing. 13th ed. McGraw-Hill, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.