27. Moreno JL. Sociometry, experimental method and the science of society. An approach to a new political orientation. Beacon, NY: Beacon House; 1951.
28. Moreno JL. Who Shall Survive? Beacon, NY: Beacon House; 1934.
29. Brown DR, Harvey D. An experiential approach to organization development. 7th ed. Pearson Prentice Hall; 2006. p. 134.
30. Chamova G. [The role of significant others for risk cluster formation in regularly drinking adolescents]. Soc Med (Sofia). 2014;2:22-4. Bulgarian.
31. Chamova G. [Psychosocial determinants of risk