Zenz, G. J. (1994). Purchasing and the management of materials (7th ed.). New York: John Wiley and Sons.
استشهاد بنمط شيكاغوZenz, Gary Joseph. Purchasing and the Management of Materials. 7th ed. New York: John Wiley and Sons, 1994.
MLA استشهادZenz, Gary Joseph. Purchasing and the Management of Materials. 7th ed. New York: John Wiley and Sons, 1994.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.