[11] Instruction Book for the Packard-Diesel Aircraft Engine (Detroit: Packard Motor Car Company, 1931), p. 3.
[12] S.A.E. Journal (April 1930), vol. 24, no. 4, pp. 431 and 432.
[13] Letter, Richard Totten to National Air Museum, January 28, 1964.
[14] Letter, Hermann I. A. Dorner to National Air Museum, December 16, 1961.
[15] The National Aeronautic Magazine (April 1932), vol. 10, no. 4. p. 18.
[16] Aviation (May 1931), vol. 30, no. 5, p. 281.
[17] The Packard Diesel Aircraft Engine, p. 5.
[18] Instruction Book for the Packard-Diesel Aircraft Engine, p. 3.
[19] “Test of Packard-Diesel radial air-cooled engine,” Navy Department, Bureau of Aeronautics, Report AEL-335, July 13, 1931, Bu. Aer. Proj. 2265.
[20] Aviation (May 1931), vol. 30, no. 5, p. 281.