APA (7 वां संस्करण) प्रशस्ति पत्र

Southworth, G. V. D., & Southworth, J. V. D. (1959). Long ago in the Old World. Iroquois Pub. Co..

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Southworth, Gertrude Van Duyn, और John Van Duyn Southworth. Long Ago in the Old World. Syracuse, N.Y.: Iroquois Pub. Co., 1959.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Southworth, Gertrude Van Duyn, और John Van Duyn Southworth. Long Ago in the Old World. Iroquois Pub. Co., 1959.