Horowitz, B. (2011). The hard thing about hard things: Building a business when there are no easy answers. New York: Crown Business.
استشهاد بنمط شيكاغوHorowitz, Ben. The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers. New York: Crown Business, 2011.
MLA استشهادHorowitz, Ben. The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers. New York: Crown Business, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.