SHEA, Peter. Introduction to the 25th Anniversary Issue of Online Learning. Online Learning, Boston, MA, v. 25, n. 1, 2021. DOI: 10.24059/olj.v25i1.2707. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/2707. Acesso em: 25 mar. 2026.