CIŻKOWICZ, Barbara. Picture of Polish School in the Studies of 15-Year-Olds?. INSTED: Interdisciplinary Studies in Education & Society, [S. l.], v. 16, n. 4(64), p. 117–130, 2013. Disponível em: https://insted-tce.pl/ojs/index.php/tce/article/view/136. Acesso em: 8 jun. 2025.