SZULC, Jolanta. Distance Learning – the Current Status and Directions for Further Research. International Journal of Research in E-learning, [S. l.], v. 6, n. 1, p. 1–19, 2020. DOI: 10.31261/IJREL.2020.6.1.02. Disponível em: https://trrest.vot.pl/ojsus/index.php/IJREL/article/view/11016. Acesso em: 7 may. 2025.