Pyotr Semyonovich Popov (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Pyotr Semyonovich Popov" in English language version.

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John L. Hart (1997), "Pyotr Semyonovich Popov: The tribulations of faith", Intelligence and National Security, Vol. 12, Iss. 4, 1997; included in Hart's The CIA's Russians (2003), here
Jeffery T. Richelson (1997), A Century of Spies: Intelligence in the Twentieth Century, Oxford University Press, p258
Nigel West (2007), Historical Dictionary of Cold War Counterintelligence, Scarecrow Press, p350
R. C. S. Trahair (2004). Encyclopedia of Cold War Espionage, Spies, and Secret Operations. Greenwood Publishing Group. p. 273. ISBN 978-0-313-31955-6.