Notes
- Andrew , Christopher and Gordievsky , Oleg . 1990 . The KGB: the Inside Story of its Foreign Operations from Lenin to Gorbachev , 334 London : Hodder & Stoughton .
- 1997 . The Times , 19 Nov.
- Childs , David and Popplewell , Richard . 1996 . The Stasi: the East German Intelligence and Security Service , 124 London : Macmillan Press .
- 1997 . Spionagechef im geheimen Krieg: Erinnerungen , München : List Verlag .
- 1997 . Deutschland Archiv , Sept/Oct. : 820 – 3 .
- 1967 . Europe: Grandeur and Decline , Harmondsworth, Middlesex : Penguin Books .