Dugdale, K., & Lambert, D. (2007). Smarter selling: Next generation sales strategies to meet your buyer's needs, every time. Financial Times Prentice Hall.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dugdale, Keith, و David Lambert. Smarter Selling: Next Generation Sales Strategies to Meet Your Buyer's Needs, Every Time. Harlow: Financial Times Prentice Hall, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Dugdale, Keith, و David Lambert. Smarter Selling: Next Generation Sales Strategies to Meet Your Buyer's Needs, Every Time. Financial Times Prentice Hall, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.