SADAF, Ayesha; MARTIN, Florence; AHLGRIM-DELZELL, Lynn. Student Perceptions of the Impact of “Quality Matters” Certified Online Courses on their Learning and Engagement. Online Learning, Boston, MA, v. 23, n. 4, 2019. DOI: 10.24059/olj.v23i4.2009. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/2009. Acesso em: 25 mar. 2026.