WALAT, W.; LIB, W. Wprowadzenie. Journal of Education, Technology and Computer Science, ISSN 2719-6550, e-ISSN 2719-7417, [S. l.], v. 2, n. 2, p. 7–9, 2010. Disponível em: https://journals.ur.edu.pl/jetacomps/article/view/7075. Acesso em: 23 sie. 2026.