APA-Zitierstil (7. Ausg.)

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

Chicago-Zitierstil (17. Ausg.)

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

MLA-Zitierstil (8. Ausg.)

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