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Beach, Alfred. "The Pneumatic Tunnel Under Broadway." Scientific American, March 5, 1870: 154.
Beach Pneumatic Transit Co. Illustrated Description of the Broadway Underground Railway: 1872.
Bobrick, Benson. Labyrinths of Iron. New York: Newsweek Books, 1981.
Callow, Alexander. The Tweed Ring, NewYork: Oxford University Press, 1966.
Cudahy, Brian J. Under the Sidewalks of New York: The Story of the Greatest Subway System in the World. Lexington: The Stephen Greene Press, 1988.
Daley, Robert. The World Beneath the City. Philadelphia and New York: J.B. Lippincott, 1959.
Hammack, David C. Power and Society: Greater New York at the Turn of the Century. New York: Russell Sage Foundation, 1982.
Hershkowitz, Leo. Tweed's New York: Another Look. Garden City: Anchor Press/Doubleday, 1997
Hood, Clifton. 722 Miles: The Building of the Subways and How They Transformed New York. New York: Simon & Schuster, 1993.
Kaempffert, Waldemar. "New York's First Subway." Scientific American, February 24, 1912.
Scientific American, Jan. 11, 1896, no. 74, p.166.
"Under Broadway," Harper's Weekly, March 12, 1870, p.164.
Walker, James Blaine. Fifty Years of Rapid Transit, 1864-1917. New York: Law Printing Co., 1918.