HELMS, Jeffrey L. Comparing Student Performance in Online and Face-to-face Delivery Modalities. Online Learning, Boston, MA, v. 18, n. 1, 2014. DOI: 10.24059/olj.v18i1.348. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/348. Acesso em: 25 mar. 2026.