Gaya APA

Schorr, J, E. (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.