APA-referens (7:e uppl.)

McCombs, C. F. (1929). The Reference department. American Library Association.

Chicago-referens (17:e uppl.)

McCombs, Charles Flowers. The Reference Department. CHicago: American Library Association, 1929.

MLA-referens (9:e uppl.)

McCombs, Charles Flowers. The Reference Department. American Library Association, 1929.