Petty, S., & Verbeck, E. (2012). Worth every penny: Build a business that thrills your customers and still charge what you're worth. Greenleaf Book Group Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Petty, Sarah, و Erin Verbeck. Worth Every Penny: Build a Business That Thrills Your Customers and Still Charge What You're Worth. Austin, Tex.: Greenleaf Book Group Press, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Petty, Sarah, و Erin Verbeck. Worth Every Penny: Build a Business That Thrills Your Customers and Still Charge What You're Worth. Greenleaf Book Group Press, 2012.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.