Cita APA (7a ed.)

Clarke, D., & Macfarlane, M. (2006). Focus on Business (New edition.). Cornelsen.

Cita Chicago Style (17a ed.)

Clarke, David, y Michael Macfarlane. Focus on Business. New edition. Berlin: Cornelsen, 2006.

Cita MLA (8a ed.)

Clarke, David, y Michael Macfarlane. Focus on Business. New edition. Cornelsen, 2006.