Dyfyniad APA

Bell, M. L. (1979). Marketing, concepts and strategy (3d ed.). Houghton Mifflin.

Dyfyniad Arddull Chicago

Bell, Martin L. Marketing, Concepts and Strategy. 3d ed. Boston: Houghton Mifflin, 1979.

Dyfyniad MLA

Bell, Martin L. Marketing, Concepts and Strategy. 3d ed. Houghton Mifflin, 1979.

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