Strutynska, Oksana, and Mariia Umryk. “Distance, Online and Blended Learning As Main Educational Trends During Pandemic 2020 Conditions”. International Journal of Research in E-learning 7, no. 1 (June 29, 2021): 1–25. Accessed May 7, 2025. https://trrest.vot.pl/ojsus/index.php/IJREL/article/view/10026.