Ries, A., & Trout, J. (1993). The 22 immutable laws of marketing: Violate them at your own risk. HarperBusiness.
Lua i Stíl Chicago (17ú heag.)Ries, Al, agus Jack Trout. The 22 Immutable Laws of Marketing: Violate Them at Your Own Risk. New York, NY: HarperBusiness, 1993.
Lua MLA (8ú heag.)Ries, Al, agus Jack Trout. The 22 Immutable Laws of Marketing: Violate Them at Your Own Risk. HarperBusiness, 1993.
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