David Cotton. (1999). Business class. London: Longman.
Trích dẫn kiểu ChicagoDavid Cotton. Business Class. London: Longman, 1999.
MLA引文David Cotton. Business Class. London: Longman, 1999.
警告：這些引文格式不一定是100％准確.
APA引文
David Cotton. (1999). Business class. London: Longman.
Trích dẫn kiểu ChicagoDavid Cotton. Business Class. London: Longman, 1999.
MLA引文David Cotton. Business Class. London: Longman, 1999.