Vavra, T. G. (1997). Improving your measurement of customer satisfaction: A guide to creating, conducting, analyzing, and reporting customer satisfaction measurement programs. ASQ Quality Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Vavra, Terry G. Improving Your Measurement of Customer Satisfaction: A Guide to Creating, Conducting, Analyzing, and Reporting Customer Satisfaction Measurement Programs. Milwaukee: ASQ Quality Press, 1997.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Vavra, Terry G. Improving Your Measurement of Customer Satisfaction: A Guide to Creating, Conducting, Analyzing, and Reporting Customer Satisfaction Measurement Programs. ASQ Quality Press, 1997.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.