Southworth, G. V. D., & Southworth, J. V. D. (1934). America's old world background: The myths of the Greeks and Norsemen, the story of early man, and the history of the old world from the dawn of civilization through the period of exploration. Iroquois.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Southworth, Gertrude Van Duyn, و John Van Duyn Southworth. America's Old World Background: The Myths of the Greeks and Norsemen, the Story of Early Man, and the History of the Old World from the Dawn of Civilization Through the Period of Exploration. Syracuse, N.Y.: Iroquois, 1934.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Southworth, Gertrude Van Duyn, و John Van Duyn Southworth. America's Old World Background: The Myths of the Greeks and Norsemen, the Story of Early Man, and the History of the Old World from the Dawn of Civilization Through the Period of Exploration. Iroquois, 1934.