Gaya APA

Burt, D, N., Pinkerton, R, L. (1996). A Purchasing manager's guide to strategic proactive procurement . New York: Amacom.

Gaya MLA

Burt, David, N.., Pinkerton, Richard, L.. "A Purchasing manager's guide to strategic proactive procurement". New York: Amacom, 1996. Text.