Cita APA (7th ed.)

Clarke, D., & Macfarlane, M. (2007). Focus on Business Workbook (New edition.). Cornelsen.

Cita Chicago (17th ed.)

Clarke, David, i Michael Macfarlane. Focus on Business Workbook. New edition. Berlin: Cornelsen, 2007.

Cita MLA (8th ed.)

Clarke, David, i Michael Macfarlane. Focus on Business Workbook. New edition. Cornelsen, 2007.