Alexandrov, Daniil, Ksenia Tenisheva, and Svetlana Savelyeva. “The Relationship Between Extracurricular Activities and Adolescents’ Academic Performance and Self-Concept”. Voprosy obrazovaniya / Educational Studies Moscow, no. 4 (December 20, 2017): 217-241. Accessed July 22, 2024. https://vo.hse.ru/article/view/15601.