Wróbel, Danuta, and Alicja Zielińska. “Teaching Polish As a Foreign Language in Mathemathics. Charactristics of the Teaching-Learning Process and Learning Contents”. Acta Universitatis Lodziensis. Kształcenie Polonistyczne Cudzoziemców, vol. 23, July 2017, pp. 127-40, doi:10.18778/0860-6587.23.10.