APA-referens (7:e uppl.)

Langan, J. (2004). College writing skills (6th ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Langan, John. College Writing Skills. 6th ed. New York: McGraw-Hill, 2004.

MLA-referens (9:e uppl.)

Langan, John. College Writing Skills. 6th ed. McGraw-Hill, 2004.