METHODOLOGICAL SUPPORT OF UKRAINIAN-LANGUAGE EDUCATIONAL INSTITUTIONS FOR ADULTS IN THE SUMY REGION IN THE 20S OF THE 20TH CENTURY. Historical studies of social progress, [S. l.], v. 1, n. 8, p. 46–56, 2024. DOI: 10.31376/2411-5177-2024-8-46-56. Disponível em: https://journals.gnpu.edu.ua/index.php/issp/article/view/279. Acesso em: 19 apr. 2026.