The History of Ultra
Garlinski, Intercept: The Enigma War, (London: Methuen, 1979), p. 23.
[4] Lewin, p. 25.
[5] Ibid., p. 26.
[6] Peter Calvocoressi, Top Secret Ultra, (Hong Kong, China: Cassell, 1980), p. 23.
[7] Lewin, p. 26.
[8] Gordon Welchman, The Hut Six Story, (NY: McGraw-Hill, 1982), pp. 35-52, passim.
[9] Winterbotham, p. 16.
[10] David Kahn, The Codebreakers, (NY: Macmillan, 1967), pp. 282-97, passim.
[11] Lewin, pp. 51-52.
[12] Andrew and Dilks, p. 136.
[13] Welchman, p. 299.
[14] Lewin, p. 119.
[15] Calvocoressi, p. 50.
[16] Ibid., pp. 50-52.
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