Source consulted: "Boeing Delivery Records, Model 95." From TMOF Tech Files.
Source consulted: Bowers, Peter M. Boeing Aircraft Since 1916. Naval Institute Press, 1989.
Source consulted: Davies, R. E. G. (Ronald Edward George). Airlines of the United States Since 1914. Smithsonian Institution Press, 1988.
Source consulted: "From Crates to Carriers." Skyways, June 1944. From TMOF Tech Files.
Source consulted: Juptner, Joseph P. U.S. Civil Aircraft. Aero Publishers, 1962-1981.
Source consulted: Lewis, J. Western Air Express: The Pioneers. From TMOF Tech Files.