Não informado. (1963). Explorations in Entrepreneurial History. Earlham College.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Explorations in Entrepreneurial History. Richmond, Ind: Earlham College, 1963.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Explorations in Entrepreneurial History. Earlham College, 1963.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.