Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.