APA aipamena

Ries, A. (1996). Focus: The future of your company depends on it. New York: HarperBusiness.

Chicago Style aipamena

Ries, Al. Focus: The Future of Your Company Depends On It. New York: HarperBusiness, 1996.

MLA aipamena

Ries, Al. Focus: The Future of Your Company Depends On It. New York: HarperBusiness, 1996.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.