1. Frederick P. Hitz ,The Great Game: The Myth and Reality of Espionage( New York : Alfred A. Knopf , 2004 ) , p. 169 .
2. Michael J. Waller ,Secret Empire: The KGB in Russia Today( Boulder , CO : Westview Press , 1994 ) , p. 86 .
3. Victor Cherkashin ,Spy Handler: Memoir of a KGB Officer( New York : Basic Books , 2005 ) , p. 278 .