Serdiuk, Liudmyla, and Olena Penkova. “ Persons’ Self-Improvement As an Integrated Self-Determined Phenomenon”. Social Welfare: Interdisciplinary Approach 5, no. 1 (May 22, 2015): 73–81. Accessed July 17, 2024. https://www.journals.vu.lt/social-welfare/article/view/28251.