Langan John. (2005). User's Guide: College Writing Skills and College Writing Skills with Readings (Tái bản lần thứ 6.). American: MC Graw Hill.
Chicago Style CitationLangan John. User's Guide: College Writing Skills and College Writing Skills With Readings. Tái bản lần thứ 6. American: MC Graw Hill, 2005.
Cita MLALangan John. User's Guide: College Writing Skills and College Writing Skills With Readings. Tái bản lần thứ 6. American: MC Graw Hill, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.