Hęclik, Karol, Lucjan Dobrowolski, Marcin Jaromin, y Iwona Zarzyka. 2023. A Practical Test of Distance Learning During the COVID-19 Lockdown. International Journal of Research in E-Learning 9 (1), 1-26. https://doi.org/10.31261/IJREL.2023.9.1.04.