Ling, J., & Smith, A. (2001). English: Workbook. Federal Publications.
Cita Chicago (17th ed.)Ling, Judy, i Anne Smith. English: Workbook. Singapore: Federal Publications, 2001.
Cita MLA (8th ed.)Ling, Judy, i Anne Smith. English: Workbook. Federal Publications, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.