Ries A I & Trout, J. (1993). Twenty two immutable laws of marketing.
Chicago Edition CitationRies A I i Jack Trout. Twenty Two Immutable Laws of Marketing. :, 1993.
Cita MLARies A I i Jack Trout. Twenty Two Immutable Laws of Marketing. 1993.
Atenció: Aquestes cites poden no estar 100% correctes.