Reuter, Timothy (2015). The New Cambridge medieval history. Vol. 3. Fouracre, Paul; McKitterick, Rosamond; Reuter, Timothy; Luscombe, D. E. (David Edward); Riley-Smith, Jonathan, 1938-2016; Abulafia, David (First paperback ed.). Cambridge: Cambridge University Press. pp. 496–500. ISBN9781107449060. OCLC945367493.
Vishnevsky, Anatoly (15 August 2000). "Replacement Migration: Is it a solution for Russia?"(PDF). EXPERT GROUP MEETING ON POLICY RESPONSES TO POPULATION AGEING AND POPULATION DECLINE /UN/POP/PRA/2000/14. United Nations Population Division, Department of Economic and Social Affairs. pp. 6, 10. Archived from the original(PDF) on December 25, 2003. Retrieved 2008-01-14.
web.archive.org
Vishnevsky, Anatoly (15 August 2000). "Replacement Migration: Is it a solution for Russia?"(PDF). EXPERT GROUP MEETING ON POLICY RESPONSES TO POPULATION AGEING AND POPULATION DECLINE /UN/POP/PRA/2000/14. United Nations Population Division, Department of Economic and Social Affairs. pp. 6, 10. Archived from the original(PDF) on December 25, 2003. Retrieved 2008-01-14.
worldcat.org
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Reuter, Timothy (2015). The New Cambridge medieval history. Vol. 3. Fouracre, Paul; McKitterick, Rosamond; Reuter, Timothy; Luscombe, D. E. (David Edward); Riley-Smith, Jonathan, 1938-2016; Abulafia, David (First paperback ed.). Cambridge: Cambridge University Press. pp. 496–500. ISBN9781107449060. OCLC945367493.
Orthodox Russia: belief and practice under the tsars. Kivelson, Valerie A. (Valerie Ann), Greene, Robert H., 1975-. University Park, Pa.: Pennsylvania State University Press. 2003. ISBN027102349X. OCLC50960735.{{cite book}}: CS1 maint: others (link)
Orthodox Russia: belief and practice under the tsars. Kivelson, Valerie A. (Valerie Ann), Greene, Robert H., 1975-. University Park, Pa.: Pennsylvania State University Press. 2003. p. 146. ISBN027102349X. OCLC50960735.{{cite book}}: CS1 maint: others (link)
