1. “Radio-Relay Systems,”;Hansell;Proc. I.R.E.,1945
2. “Rockets,” Willy Ley. (Viking Press, N.Y.)
3. “Das Problem der Befahrung des Weltraums,” Hermann Noordung.
4. “Frequency Modulation,” A. Hund. (McGraw Hill.)
5. “London Television Service,” MacNamara and Birkinshaw. J.I.E.E., Dec., 1938.