Robert D. Crews, For Prophet and Tsar: Islam and Empire in Russia and Central Asia, Harvard University Press, 2006, ISBN0-674-02164-9, Google Print, p.77
Deborah Goodwin, Matthew Midlane, Negotiation in International Conflict: Understanding Persuasion, Taylor & Francis, 2002, ISBN0-7146-8193-8, Google Print, p.158
Nicolas Spulber, Russia's Economic Transitions: From Late Tsarism to the New Millennium, Cambridge University Press, 2003, ISBN0-521-81699-8, Google Print, p.27-28
Richard Pipes, Russian Conservatism and Its Critics: A Study in Political Culture, Yale University Press, 2007, ISBN0-300-12269-1, Google Print, p.181
Wortman, pg. 10. A political theory prevalent amongst many Orthodox Russians into the twentieth century postulated that there were three "Romes": the first (Rome) had allegedly apostatized from true Christianity after the Great Schism of 1054 between Roman Catholicism and Eastern Orthodoxy; the second (Constantinople) had equally apostatized by accepting Roman Catholicism at the Council of Florence and had subsequently fallen to the Turks; Moscow and "Holy Russia" were the third Rome, and (according to this doctrine) "a fourth there shall never be". A History of Russia, Chapter 1: Medieval Russia, Section "Ivan the Great".
