CERRILLO, R. A.; RODRIGUEZ, M. G. L. VAT And Electronic Books. International Business & Economics Research Journal (IBER), [S. l.], v. 13, n. 8, p. 1651–1658, 2015. DOI: 10.19030/iber.v13i8.9064. Disponível em: https://clutejournals.com/index.php/IBER/article/view/9064. Acesso em: 17 jul. 2024.