Pieniążek, M. “Comparison of National Language Teaching Systems. Introduction”. Annales Universitatis Paedagogicae Cracoviensis. Studia Ad Didacticam Litterarum Polonarum Et Linguae Polonae Pertinentia, vol. 8, no. 227, July 2017, https://didactica.uken.krakow.pl/article/view/4484.