BLISS, T.; HILTON III, J.; WILEY, D.; THANOS, K. The cost and quality of online open textbooks: Perceptions of community college faculty and students. First Monday, [S. l.], v. 18, n. 1, 2013. DOI: 10.5210/fm.v18i1.3972. Disponível em: https://firstmonday.org/ojs/index.php/fm/article/view/3972. Acesso em: 19 sep. 2021.