Gaya APA

Zenz, J, W, ;, I, F, ;, G, J. (1976). Purchasing management: materials in motion (ed. 4). Canada: John Wiley.

Gaya MLA

Zenz, J.H., Westing, ;, I.V, Fine, ;, Gary, Joseph. "Purchasing management: materials in motion". ed. 4 Canada: John Wiley, 1976. Text.