CZERKA-FORTUNA, E. Learning Systems. Development of Professional Competences of School Heads and Teachers. Przegląd Badań Edukacyjnych (Educational Studies Review), [S. l.], v. 2, n. 27, p. 167–181, 2018. DOI: 10.12775/PBE.2018.023. Disponível em: https://apcz.umk.pl/PBE/article/view/PBE.2018.023. Acesso em: 20 apr. 2024.