P. Kaźmierczak and J. Sroka, “Youtube czy Studytube – overview of selected profiles about teaching Polish as a foreign language”, in Activation-innovation-inspiration in (glotto) didactics, B. Grochala, M. Pokorska, and M. Syrek, Eds. Poland: Lodz University Press, 2022, pp. 25–39. doi: 10.18778/8220-940-2.03.