Deci, E. L. (1975). Intrinsic motivation. New York: Plenum.
Deci, E. L. et al. (2001). Need satisfaction, motivation, and well-being in the work organizations of a former Eastern Bloc country. Personality and Social Psychology Bulletin, 27, p. 930-942.
Herzberg, F., B. Mausner, B. B. Snyderman (1959). The Motivation to Work (2nd ed.). New York: John Wiley.
Herzberg, F. (1964). The Motivation-Hygiene Concept and Problems of Manpower. Personnel Administration (27), January-February, p. 3-7.
Ilieva, S. (1998). Affection with the organization. Psychological analysis. Sofia: Albatros Publishing House (in Bulgarian).
Ilieva, S. (2004). The motivation of university professors and employees as a factor for organizational effectiveness and development. In: Collection: Governance and Sustainable Development. 6th Scientific Conference. Sofia: LTU (in Bulgarian).
Ilieva, S. (2009). Values and work motivation. Sofia: University “St. Kliment Ohridski” (in Bulgarian).
Maslow, E. (2001). Motivation and personality. Sofia: Kibea Publishing House (in Bulgarian).
Kreitner, R., A. Kinicki & M. Buelens (1999). Organizational Behaviour. 1st European Edition. McGraw Hill.
Loukanova, P. (2018). The Implementation of European Youth Guarantee in Bulgaria – Results and Perspectives. Economic Studies Journal, N 6.
Loukanova, P. (2019). Labour Market. In: Annual Report 2018: Economic Development and Policies in Bulgaria: Estimates and Expectations. Sofia: GorexPress Publishing House (in Bulgarian).
Paunov, M. (2009). Work motivation. Sofia: Ciela Publishing House (in Bulgarian). Shopov, G., V. Tzanov (2015). Territorial disparities in living standard of the population in Bulgaria – situation and evolution (2007-2012). Papers of BAS. (Humanities and Social Sciences), Vol. 2, N 1-2, p. 157-184.
Surcheva, Zh. (2004). Work Motivation – A Review of Some Theoretical Positions, Part II Review. Available at: http://nt-cmb.mu-sofia.bg:8080/jspui/bitstream/10861/30/1/ Surcheva_Zh_Pocess-Theories-of-Work-Motivation.pdf (in Bulgarian).
Topuzova, I. (2016). Structure of work motivation and relationship with work satisfaction of the university teachers. Available at: https://www.researchgate.net/ publication/314078071 (in Bulgarian).
Tsanov, V. (2014). Focus Topic: Inequality and Poverty – Dynamics and Policies for Limiting them. In: Annual Report 2014: Economic Development and Policies in Bulgaria: Estimates and Expectations. Sofia: GorexPress Publishing House (in Bulgarian).