BUGAYCHUK, Konstyantyn L. ELECTRONIC TEXTBOOK: CONCEPT, STRUCTURE, REQUIREMENTS. Information Technologies and Learning Tools, [S. l.], v. 22, n. 2, 2011. DOI: 10.33407/itlt.v22i2.437. Disponível em: https://journal.iitta.gov.ua/index.php/itlt/article/view/437.. Acesso em: 7 may. 2024.