Reichheld, F. (2011). The ultimate question 2.0: How net promoter companies thrive in a customer-driven world. Boston, Mass: Harvard Business Press.
استشهاد بنمط شيكاغوReichheld, Fred. The Ultimate Question 2.0: How Net Promoter Companies Thrive in a Customer-driven World. Boston, Mass: Harvard Business Press, 2011.
MLA استشهادReichheld, Fred. The Ultimate Question 2.0: How Net Promoter Companies Thrive in a Customer-driven World. Boston, Mass: Harvard Business Press, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.