APA-referens (7:e uppl.)

Langan, J. (1995). English skills with readings (3rd ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Langan, John. English Skills with Readings. 3rd ed. New York: McGraw-Hill, 1995.

MLA-referens (8:e uppl.)

Langan, John. English Skills with Readings. 3rd ed. McGraw-Hill, 1995.