Langan, J. (2014). College writing skills with readings 9th ed. McGraw-Hill.
Chicago-referens (17:e uppl.)Langan, John. College Writing Skills with Readings 9th Ed. McGraw-Hill, 2014.
MLA-referens (8:e uppl.)Langan, John. College Writing Skills with Readings 9th Ed. McGraw-Hill, 2014.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.