Becker-Pestka, Daria Joanna. “E-Learning for Prisoners. Experience from Sweden, Norway, Poland, Finland and Germany”. International Journal of Research in E-learning 8, no. 1 (June 30, 2022): 1–24. Accessed May 7, 2025. https://trrest.vot.pl/ojsus/index.php/IJREL/article/view/13528.