Ries, A. (1993). The 22 immutable laws of marketing. New York: Harper Business.
Chicago ZitierstilRies, Al. The 22 Immutable Laws of Marketing. New York: Harper Business, 1993.
MLA ZitierstilRies, Al. The 22 Immutable Laws of Marketing. New York: Harper Business, 1993.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.