Cita APA (7a ed.)

Cotton, D., & Robbins, S. (1997). Business class. Addison Wesley Longman.

Cita Chicago Style (17a ed.)

Cotton, David, y Sue Robbins. Business Class. Harlow: Addison Wesley Longman, 1997.

Cita MLA (9a ed.)

Cotton, David, y Sue Robbins. Business Class. Addison Wesley Longman, 1997.