1. Pirogov's Spiritual Legacy
2. Severnyi Kavkaz v prostranstve russkogo diskursa;Vitaly Ulanov;Evrazia. org,2011
3. Spisok rossiiskikh regionov po VRP;Wikipedia.Ru,2012
4. The other half are the Tatar and Bashkir, who live along the Volga in Central Russia;Alexei Malashenko;Social Research,2009