Ries, A. (1996). The 22 Immutable laws of marketing. Harper Collins Publications.
Chicago Style aipamenaRies, AI. The 22 Immutable Laws of Marketing. New delhi: Harper Collins Publications, 1996.
MLA aipamenaRies, AI. The 22 Immutable Laws of Marketing. Harper Collins Publications, 1996.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.