Dyfyniad APA

Poperch. Elizabeth. (1983). Product marketing. Cherbson publishing co.

Dyfyniad Arddull Chicago

Poperch. Elizabeth. Product Marketing. New York: Cherbson publishing co, 1983.

Dyfyniad MLA

Poperch. Elizabeth. Product Marketing. Cherbson publishing co, 1983.

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