Burton, F., & Bruning, J. R. (2011). Chasing shadows: A special agent's lifelong hunt to bring a Cold War assassin to justice. Palgrave Macmillan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBurton, Fred, और John R. Bruning. Chasing Shadows: A Special Agent's Lifelong Hunt to Bring a Cold War Assassin to Justice. New York, NY: Palgrave Macmillan, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBurton, Fred, और John R. Bruning. Chasing Shadows: A Special Agent's Lifelong Hunt to Bring a Cold War Assassin to Justice. Palgrave Macmillan, 2011.
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