West, Nigel. The Branch – a History of the Metropolitan Police Special Branch 1883 – 1983 (London: Seeker & Warburg, 1983).
West, Nigel. Unreliable Witness. Espionage Myths of the Second World War (London-Weidenfeld & Nicolson, 1984).
Whaley, Barton. 'Covert Rearmament in Germany 1919 – 1939: Deception and Misperception'. Journal of Strategic Studies, part 5 (March 1982).
Wheeler, Mark. 'The SOE Phenomenon'. In Walter Laqueur (ed.), The Second World War (London and Beverley Hills, Calif.: Sage, 1982).
Whitwell, John. British Agent (London: Kimber, 1966).
Winterbotham, F. W. Secret and Personal (London: Kimber, 1969).
Winterbotham, F. W. The Ultra Secret (London: Weidenfeld & Nicolson, 1974).
Wise, David, and Ross, Thomas B. The Invisible Government (London: Cape, 1965).
Wise, David, and Ross, Thomas B. The Espionage Establishment (New York: Random House, 1967).
Yardley, Herbert O. The American Black Chamber (New York: Ballantine, 1981).
Yergin, Daniel. Shattered Peace (London: Deutsch, 1978).
Young, Kenneth. The Diaries of Sir Robert Bruce Lockhart: Vol. I 1915 – 1938 (London-Macmillan, 1973)