Hartman, G. (1939). Machines and the men who made the world of industry. The Macmillan company.
Chicago Style (17th ed.) CitationHartman, Gertrude. Machines and the Men Who Made the World of Industry. New York: The Macmillan company, 1939.
MLA (9th ed.) CitationHartman, Gertrude. Machines and the Men Who Made the World of Industry. The Macmillan company, 1939.
Warning: These citations may not always be 100% accurate.