Bielak, Jakub, Mirosław Pawlak, and Anna Mystkowska-Wiertelak. “Teaching the English Active and Passive Voice With the Help of Cognitive Grammar: An Empirical Study”. Studies in Second Language Learning and Teaching 3, no. 4 (October 1, 2013): 581–619. Accessed May 4, 2024. https://pressto.amu.edu.pl/index.php/ssllt/article/view/5026.