TROJAN, Vaclav. The issues of professional preparation of school headmasters in the Czech Republic. Opus et Educatio, [S. l.], v. 3, n. 2, 2016. 10.3311/ope.87. Disponível em: https://journals.bme.hu/oee/article/view/38987. Acesso em: 6 jul. 2025.