APA-referens (7:e uppl.)

Langan, J. (2001). Sentence skills with readings (second edition.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Langan, John. Sentence Skills with Readings. second edition. Boston: McGraw-Hill, 2001.

MLA-referens (8:e uppl.)

Langan, John. Sentence Skills with Readings. second edition. McGraw-Hill, 2001.