Leenders, M. R. (1965). Improving purchasing effectiveness through supplier development. Division of Research, Graduate School of Business Administration, Harvard University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Leenders, Michiel R. Improving Purchasing Effectiveness Through Supplier Development. Boston: Division of Research, Graduate School of Business Administration, Harvard University, 1965.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Leenders, Michiel R. Improving Purchasing Effectiveness Through Supplier Development. Division of Research, Graduate School of Business Administration, Harvard University, 1965.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.