APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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