(en) NACA/National Advisory Committee for Aeronautics (ancêtre de la NASA), Bibliography of Aeronautics 1917-1919, Washington, Washington Government Printing Office, (lire en ligne), p. 64
(en) Catalogue of the Public Documents of the Sixty-Fifth Congress and of all Departments of the Government of the United States., Washington, Government of the United States., (lire en ligne), p. 296