APA-referens (7:e uppl.)

Southworth, G. V. D., & Southworth, J. V. D. (1958). A work book on Long ago in the Old World. Iroquois Pub. Co..

Chicago-referens (17:e uppl.)

Southworth, Gertrude Van Duyn, och John Van Duyn Southworth. A Work Book on Long Ago in the Old World. Syracuse, N.Y.: Iroquois Pub. Co., 1958.

MLA-referens (8:e uppl.)

Southworth, Gertrude Van Duyn, och John Van Duyn Southworth. A Work Book on Long Ago in the Old World. Iroquois Pub. Co., 1958.