E., S., J.(1992).Purchasing in the 21st century : a guide to state-of-the-art techniques and strategies / John E. Schorr .Essex Junction:Oliver Wight Publishers.
Gaya MLA
Schorr, John, E.."Purchasing in the 21st century : a guide to state-of-the-art techniques and strategies / John E. Schorr".Essex Junction:Oliver Wight Publishers,1992.Textbook.