SHEA, Peter J. Introduction. Online Learning, Boston, MA, v. 21, n. 1, 2017. DOI: 10.24059/olj.v21i1.1183. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1183. Acesso em: 25 mar. 2026.