Strugielska, Ariadna, and Katarzyna Piątkowska. “Challenges With Defning Competence for Foreign Language Learning and Teaching on the Basis of the Common European Framework of Reference***”. Theoria et Historia Scientiarum 15 (December 13, 2018): 21. Accessed July 18, 2024. https://apcz.umk.pl/THS/article/view/ths.2018.002.