1. “Aero Engines 1967,” Flight Magazine,# 2531, v. 72, 26 July 57, pp. 107–110.
2. Otis E. Lancaster, “Aviation,” Journal of Engineering for Power, American Society of Mechanical Engineers, vol. 81, ser. A, no. 3, July, 1959, p. 269.
3. “Aero Engines 1960,” Flight Magazine,#2662, v. 77, 14 Mar 1960, pp. 367 ff.
4. Edward Constant, The Origins of the Turbojet Revolution (Baltimore: Johns Hopkins University Press, 1981).
5. For a detailed discussion of data regarding the economics of aircraft engines in different flight regimes over time, see D. J. Jordan and H. S. Crim, “Evolution of Modern Air-Transport Powerplants,” Journal of Aircraft, v. 1, no. 5, 1964, pp. 225–229.