SWAN, Karen; BLOEMER, William; DAY, Scott. Gap Analysis: An Innovative Look at Gateway Courses and Student Retention. Online Learning, Boston, MA, v. 21, n. 3, 2017. DOI: 10.24059/olj.v21i3.1233. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1233. Acesso em: 27 mar. 2026.