APA (7th ed.) Citation

Gutjahr, L., & Mahoney, S. (2009). English for sales & purchasing. Oxford University Press.

Chicago Style (17th ed.) Citation

Gutjahr, Lothar, and Sean Mahoney. English for Sales & Purchasing. Oxford ; New York: Oxford University Press, 2009.

MLA (9th ed.) Citation

Gutjahr, Lothar, and Sean Mahoney. English for Sales & Purchasing. Oxford University Press, 2009.