About the Westinghouse Companies circa 1904:
75th Anniversary of the Westinghouse Brake Company: Commemorating Three-Quarters of a Century of Pioneering, Wilmerding, PA: The Westinghouse Air Brake Company, 1944.
The Westinghouse Companies in the Railway & Industrial Fields, Westinghouse Companies Publishing Department, 1905.
Works of Westinghouse Electric & Manufacturing Company: Their Industrial and Sociological Aspect, Westinghouse Electric & Manufacturing Company, 1904.
About George Westinghouse:
"A Big Man with a Hundred Thousand Horsepower Inside," Wilmerding News. Wilmerding, PA: Sept. 30, 1904.
The Encyclopedia Americana, vol. 28. Danbury, CT: Grolier Incorporated, 1987.
George Westinghouse: His Life and His Achievements. Westinghouse Electric Corporation, 1946.
Leupp, Francis E. George Westinghouse: His Life and His Achievements. Boston: Little, Brown, and Company, 1918.
Prout, Henry G. A Life of George Westinghouse. New York: Charles Scribner's Sons, 1922.
Thomas, Henry. George Westinghouse. New York: G. P. Putnam's Sons, 1960.
About the U.S., industries, and workers circa 1904 (most mention the Westinghouse companies):
Chandler, Jr., Alfred D. The Visible Hand: The Managerial Revolution in American Business. Cambridge, MS: The Belknap Press of Harvard University Press, 1977.
DeSantis, Vincent P. The Shaping of Modern America: 1877-1920. Arlington Heights, IL: Forum Press, Inc., 1973.
Galambos, Louis. The Public Image of Big Business in America, 1880-1940: A Quantitative Study in Social Change. Baltimore: The Johns Hopkins University Press, 1975.
Licht, Walter. Industrializing America: The Nineteenth Century. Baltimore: The Johns Hopkins University Press, 1995.
Montgomery, David. The Fall of the House of Labor: The Workplace, the State and American Labor Activism, 1865-1925. Cambridge: Cambridge University Press, 1987.
Nelson, Daniel. Managers and Workers: Origins of the Twentieth-Century Factory System in the United States, 1880-1920. Madison, WI: University of Wisconsin Press, 1995.
Palladino, Grace. Dreams of Dignity, Workers of Vision: A History of the International Brotherhood of Electrical Workers. Washington, DC: International Brotherhood of Electrical Workers, 1991.
Ramirez, Bruno. When Workers Fight: The Politics of Industrial Relations in the Progressive Era, 1898-1916. Westport, CT: Greenwood Press, 1978.
Wiebe, Robert H. The Search for Order: 1877-1920. New York: Hill and Wang, 1967.