Anderson, Julie (2007). „The HUMINT Offensive from Putin's Chekist State”. International Journal of Intelligence and CounterIntelligence. 20 (2): 258—316. S2CID154067244. doi:10.1080/08850600601079958.
dss.mil
Defense Personnel Security Research Center. „Espionage Cases 1975–2004”. Архивирано из оригинала 4. 2. 2006. г. Приступљено 19. 2. 2006.CS1 одржавање: Формат датума (веза)
Anderson, Julie (2007). „The HUMINT Offensive from Putin's Chekist State”. International Journal of Intelligence and CounterIntelligence. 20 (2): 258—316. S2CID154067244. doi:10.1080/08850600601079958.