APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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