Heil, G., Parker, T., & Stephens, D. C. (1999). One size fits one: Building relationship one customer and one employee at a time (2nd ed.). Wiley.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Heil, Gary, Tom Parker, و Deborah C. Stephens. One Size Fits One: Building Relationship One Customer and One Employee at a Time. 2nd ed. New York: Wiley, 1999.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Heil, Gary, et al. One Size Fits One: Building Relationship One Customer and One Employee at a Time. 2nd ed. Wiley, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.