Harding, L. (2017). A very expensive poison: The assassination of Alexander Litvinenko and Putin's war with the West. Vintage Books, a division of Penguin Random House LLC.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHarding, Luke. A Very Expensive Poison: The Assassination of Alexander Litvinenko and Putin's War with the West. New York: Vintage Books, a division of Penguin Random House LLC, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHarding, Luke. A Very Expensive Poison: The Assassination of Alexander Litvinenko and Putin's War with the West. Vintage Books, a division of Penguin Random House LLC, 2017.
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