Citazione Stile APA (7a Edizione)

Ries, A. (2005). Focus: The future of your company depends on it ([2nd ed.].). HarperCollins.

Citazione stile Chigago Style (17a edizione)

Ries, Al. Focus: The Future of Your Company Depends on It. [2nd ed.]. New York: HarperCollins, 2005.

Citatione MLA (9a ed.)

Ries, Al. Focus: The Future of Your Company Depends on It. [2nd ed.]. HarperCollins, 2005.