Żytko, Małgorzata. 2013. “OBUT (Nationwide Research on School Achievements of 9-Year Olds) - Pedagogical Experiment With ‘Policy Context’”. INSTED: Interdisciplinary Studies in Education & Society 16 (4(64):101-16. https://insted-tce.pl/ojs/index.php/tce/article/view/135.