Dyfyniad APA
Assael, H. (1990). Marketing: Principles & strategy (2nd ed.). Harcourt brace.
Dyfyniad Arddull Chicago
Assael, Henry. Marketing: Principles & Strategy. 2nd ed. Philadelphia: Harcourt brace, 1990.
Dyfyniad MLA
Assael, Henry. Marketing: Principles & Strategy. 2nd ed. Harcourt brace, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.