Ries, A. (1996). Focus: The future of your company depends on it. Harper Business.
Styl ChicagoRies, Al. Focus: The Future of Your Company Depends on It. New York: Harper Business, 1996.
Citace podle MLARies, Al. Focus: The Future of Your Company Depends on It. Harper Business, 1996.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..