1. Federal State Statistics Service. htpp//www.gks.ru
2. Social Status and Standard of Living of the Russian Poplation (Rosstat, Moscow, 2010).
3. Results of the 2009 Work for the Implementation of State Supervision and Control Over the Observance of Labor Laws and Other Normative Legal Acts Containing Norms of the Labor Law (Rostrud, Moscow, 2010).
4. Report on the Implementation of State Policies on Working Conditions and Labor Protection in the Russian Federation in 2007 (Ministry of Health and Social Development of the Russian Federation, Moscow, Russia, 2008).
5. Social Status and Standard of Living of the Russian Population (Rosstat, Moscow, 2001).