Papaja, Katarzyna, and Wysocka-NarewskaMarzena. “Investigating Code-Switching in a Content and Language Integrated Learning (CLIL) Classroom”. Theory and Practice of Second Language Acquisition 6, no. 1 (June 8, 2020): 51-63. Accessed May 2, 2024. https://www.journals.us.edu.pl/index.php/TAPSLA/article/view/7808.