Leo Tolstoy (2012). “The Anna Karenina Companion: Includes Complete Text, Study Guide, Biography, and Character Index: BookCaps Study Guide”, p.513, BookCaps Study Guides
Leo Tolstoy (2016). “The Complete Novels of Leo Tolstoy in One Premium Edition (World Classics Series): Anna Karenina, War and Peace, Resurrection, Childhood, Boyhood, Youth, The Cossacks, The Death of Ivan Ilyich... (Including Biographies of the Author)”, p.341, e-artnow