HURALIUK, Andriy. ELECTRONIC TEXTBOOK PHENOMENON. Professional Pedagogics, Kyiv, n. 6, p. 57–63, 2013. DOI: 10.32835/2223-5752.2013.6.57-63. Disponível em: https://jrnls.ivet.edu.ua/1/article/view/435. Acesso em: 10 jul. 2026.