PETKO, Dominik; EGGER, Nives. Who Needs Educational Portals? A Survey on Users and Usage. Swiss Journal of Educational Research, Bern, v. 37, n. 3, p. 527–546, 2015. DOI: 10.24452/sjer.37.3.4966. Disponível em: https://sjer.ch/article/view/4966. Acesso em: 14 mar. 2025.