Cita APA (7a ed.)

Ling, J., & Smith, A. (2001). English: Workbook. Federal Publications.

Cita Chicago Style (17a ed.)

Ling, Judy, y Anne Smith. English: Workbook. Singapore: Federal Publications, 2001.

Cita MLA (8a ed.)

Ling, Judy, y Anne Smith. English: Workbook. Federal Publications, 2001.