FREDERICKSEN, Eric E. A National Study of Online Learning Leaders in US Higher Education. Online Learning, Boston, MA, v. 21, n. 2, 2017. DOI: 10.24059/olj.v21i2.1164. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1164. Acesso em: 4 apr. 2026.