Não informado. (1963). Explorations in Entrepreneurial History. Earlham College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Explorations in Entrepreneurial History. Richmond, Ind: Earlham College, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Explorations in Entrepreneurial History. Earlham College, 1963.
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