GALWAS, Bogdan A.; PAJER, Mariusz; CHĘĆ , Jolanta. Model of e-book for distance-learning courses. Journal of Telecommunications and Information Technology, [S. l.], v. 4, n. 2, p. 46–50, 2001. DOI: 10.26636/jtit.2001.2.54. Disponível em: https://jtit.pl/jtit/article/view/54. Acesso em: 9 oct. 2025.