Schorr, J. E. (1992). Purchasing in the 21st century: : a guide to state-of-the-art techniques and strategies. Essex Junction, VT.: Oliver Wight Publications, Inc..
Παραπομπή Chicago StyleSchorr, John E. Purchasing in the 21st Century: : A Guide to State-of-the-art Techniques and Strategies. Essex Junction, VT.: Oliver Wight Publications, Inc., 1992.
Παραπομπή MLASchorr, John E. Purchasing in the 21st Century: : A Guide to State-of-the-art Techniques and Strategies. Essex Junction, VT.: Oliver Wight Publications, Inc., 1992.
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