BONK, Curtis J.; ZHU, Meina; DOO, Min Young. Systematic review of retention and learning engagement in online learning from 2015-2025. Online Learning, Boston, MA, v. 30, n. SI2, p. Article e5893, 2026. DOI: 10.24059/olj.v30iSI2.5893. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/5893. Acesso em: 6 nov. 2026.