Não informado. (1963). Explorations in Entrepreneurial History. Earlham College.
Chicago-viite (17. p.)Não informado. Explorations in Entrepreneurial History. Richmond, Ind: Earlham College, 1963.
MLA-viite (8. p.)Não informado. Explorations in Entrepreneurial History. Earlham College, 1963.
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