VAN SCHOOR, W. .; POTGIETER , D. . How can we retain them? An investigation into the early cancellation of courses in a distance learning institution. South African Journal of Higher Education, [S. l.], v. 25, n. 3, 2011. DOI: 10.20853/25-3-5540. Disponível em: https://www.journals.ac.za/sajhe/article/view/5540. Acesso em: 7 oct. 2025.