ドナルド・ウィルズ・ダグラス・シニア
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Sobel, Robert (1974). “Donald Douglas: The Fortunes of War”. The Entrepreneurs: Explorations Within the American Business Tradition. New York: Weybright & Talley. pp. 289–340. ISBN 0-679-40064-8. https://archive.org/details/entrepreneursexp00sobe/page/289