セオドア・ニュートン・ヴェイル
Gleason, Arthur H. (February 1912). “A Cable Rate For Common Use: An Interview With Theodore N. Vail, The Head Of The Bell Telephone And Western Union Telegraph And Cable Companies”. The World's Work: A History of Our Time XXIII: 452–457. https://books.google.com/books?id=Vv--PfedzLAC&pg=PA452 2009年7月10日閲覧。.
Sobel, Robert (1974). “Theodore N. Vail : The Subtle Serendipidist”. The Entrepreneurs: Explorations Within the American Business Tradition. New York: Weybright & Talley. pp. 195–246. ISBN 0-679-40064-8. https://archive.org/details/entrepreneursexp00sobe/page/195