Grotek, Monika, and Grażyna Kiliańska-Przybyło. “The Role of Affective Factors in the Process of Learning a Foreign Language by Late Adults”. INSTED: Interdisciplinary Studies in Education & Society, vol. 15, no. 3(59), Sept. 2012, pp. 111-24, https://insted-tce.pl/ojs/index.php/tce/article/view/216.