APA-referens (7:e uppl.)

Langan, J. (2003). Sentence skills: A workbook for writers : form A (7th ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Langan, John. Sentence Skills: A Workbook for Writers : Form A. 7th ed. Boston: McGraw-Hill, 2003.

MLA-referens (8:e uppl.)

Langan, John. Sentence Skills: A Workbook for Writers : Form A. 7th ed. McGraw-Hill, 2003.