Chernysh N.A. Ч. Н. System principles of recreational activities. Рroblems of engineering and professional education, [S. l.], v. 19, n. 4, p. 21–23, 2023. DOI: 10.32523/2220-685X-2013-19-4-21-23. Disponível em: https://bulprengpe.enu.kz/index.php/main/article/view/535. Acesso em: 24 nov. 2024.