Southworth, G. V. D., & Southworth, J. V. D. (1951). A work book on The story of our America. Iroquois Pub. Co..
Lua i Stíl Chicago (17ú heag.)Southworth, Gertrude Van Duyn, agus John Van Duyn Southworth. A Work Book on The Story of Our America. Iroquois Pub. Co., 1951.
Lua MLA (8ú heag.)Southworth, Gertrude Van Duyn, agus John Van Duyn Southworth. A Work Book on The Story of Our America. Iroquois Pub. Co., 1951.
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