1. F.H. Hinsley with E.E. Thomas, C.A.G. Simkins and C.F.G. Ransom, British Intelligence in the Second World War: Its Influence on Strategy and Operations. Vol. 3, Part II (London: H.M.S.O. and New York: Cambridge University Press, 1988), pp. 583-585, 591, 933-937; Albert Speer, Erinnerungen (Frankfurt and Berlin: Verlag Ullstein GmbH, 1969), pp. 241-242; translated by Richard and Clara Winston as Inside The Third Reich. Memoirs (New York: The Macmillan Company, 1970), pp. 227-228.
2. R.V. Jones, Reflections on Intelligence (London: William Heinemann Ltd., 1989), p. 58.
3. Margaret Gowing, Britain and Atomic Energy 1939-1945 (London: Macmillan & Co. and New York: St. Martin’s Press, 1964), p. 34.
4. Sverre Kjeldstadli, Hjemmestyrkene. Hovedtrekk av den militære motstanden under okkupasjonen (Oslo: H. Aschehoug & Col. (W. Nygaard), 1959; reissued by Oslo: Bokstav & Bilde, 2011), p. 202.
5. Per F. Dahl, Heavy Water and the Wartime Race for Nuclear Energy (Bristol and Philadelphia: Institute of Physics Publishing, 1999), pp. 27-33.