ROYDEN B. G. Tolkachev, a Worthy Successor to Penkovsky // Studies in Intelligence. 2003. Vоl. 47. № 3. P. 22. Также см.: WALLACE R., MELTON H. K. (with Schlesinger H. R.). Spycraft: The Secret History of the CIA’s Spytechs from Communism to al-Qaeda. New York: Dutton, 2008. Pp. 130–131.
