KOVALEV, E. E-studia na kierunku „Biznes informacyjny w Rosji”. Journal of Education, Technology and Computer Science, ISSN 2719-6550, e-ISSN 2719-7417, [S. l.], v. 5, n. 1, p. 118–119, 2012. Disponível em: https://journals.ur.edu.pl/jetacomps/article/view/6953. Acesso em: 23 sie. 2026.