SWEET, Robert. Canadian Proprietary Correspondence Schools: Some Issues of Access and Technology. International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, [S. l.], v. 6, n. 1, p. 42–63, 1991. Disponível em: https://ijede.ca/index.php/jde/article/view/393. Acesso em: 4 dec. 2024.