APA引文

Gutjahr, L. (2009). English for sales & purchasing. Oxford (New York): Oxford University Press.

Trích dẫn kiểu Chicago

Gutjahr, Lothar. English for Sales & Purchasing. Oxford (New York): Oxford University Press, 2009.

MLA引文

Gutjahr, Lothar. English for Sales & Purchasing. Oxford (New York): Oxford University Press, 2009.

警告：這些引文格式不一定是100％准確.