District, New York (State) Public Service Commission First (1916). Proceedings. The Commission. p. 529. Archived from the original on July 5, 2022. Retrieved July 5, 2022.
"New York City Notes", The Express Gazette, 31 (1): 26, January 15, 1906 [1873], archived from the original on April 7, 2022, retrieved October 17, 2016
Fitzpatrick, Francis (December 1919). "Cutting Steps in the Skyscraper". Popular Science. Vol. 95, no. 5. p. 52. Retrieved August 20, 2014.
Boucher, Mike. "What Happened on This Day". The Month of March. The Unofficial Home Page of FDNY. Archived from the original on November 11, 2014. Retrieved August 12, 2014.
District, New York (State) Public Service Commission First (1916). Proceedings. The Commission. p. 529. Archived from the original on July 5, 2022. Retrieved July 5, 2022.
Boucher, Mike. "What Happened on This Day". The Month of March. The Unofficial Home Page of FDNY. Archived from the original on November 11, 2014. Retrieved August 12, 2014.
"New York City Notes", The Express Gazette, 31 (1): 26, January 15, 1906 [1873], archived from the original on April 7, 2022, retrieved October 17, 2016
Nash, Eric Peter (2010). Manhattan skyscrapers. McGrath, Norman. (3rd ed.). New York: Princeton Architectural Press. p. 25. ISBN978-1-56898-967-9. OCLC542321843.