APA-referens (7:e uppl.)

Knowlton, D. C. (1930). The Knowlton work-book in American history. Century Co.

Chicago-referens (17:e uppl.)

Knowlton, Daniel C. The Knowlton Work-book in American History. New York, London: Century Co, 1930.

MLA-referens (8:e uppl.)

Knowlton, Daniel C. The Knowlton Work-book in American History. Century Co, 1930.