Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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