William Crowninshield Endicott. In: U.S. Army Center of Military History. U.S. Army, 2. März 2001, abgerufen am 14. April 2023 (englisch).
books.google.com
United States Board on Fortifications or Other Defenses: Report of the Board on Fortifications Or Other Defenses Appointed by the President of the United States Under the Provisions of the Act of Congress Approved March 3, 1885 ... U.S. Government Printing Office, 1886 (google.com [abgerufen am 11. April 2023]).