Ries A I & Trout, J. (1993). Twenty two immutable laws of marketing.
Chicago Style aipamenaRies A I and Jack Trout. Twenty Two Immutable Laws of Marketing. :, 1993.
MLA aipamenaRies A I and Jack Trout. Twenty Two Immutable Laws of Marketing. 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.