Dyfyniad APA

Ries A I & Trout, J. (1993). Twenty two immutable laws of marketing.

Dyfyniad Arddull Chicago

Ries A I and Jack Trout. Twenty Two Immutable Laws of Marketing. :, 1993.

Dyfyniad MLA

Ries A I and Jack Trout. Twenty Two Immutable Laws of Marketing. 1993.

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