Harding, L., & Smith, N. G. (2017). A very expensive poison: The assassination of alexander litvinenko and putin's war with the west (Unabridged.). Random House Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Harding, Luke, و Nicholas Guy Smith. A Very Expensive Poison: The Assassination of Alexander Litvinenko and Putin's War with the West. Unabridged. New York: Random House Audio, 2017.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Harding, Luke, و Nicholas Guy Smith. A Very Expensive Poison: The Assassination of Alexander Litvinenko and Putin's War with the West. Unabridged. Random House Audio, 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.