↑Sobel, Robert (1972). The Age of Giant Corporations: a Microeconomic History of American Business, 1914-1970. Westport, Conn., Greenwood Press: Greenwood Press. ISBN978-0-8371-6404-5. OCLC488208
↑Herman, Arthur (2012). Freedom's Forge: How American Business Produced Victory in World War II. New York, NY: Random House. p. 6. ISBN978-1-4000-6964-4