WILLIAMS, David D.; EISERMAN, William D.; QUINN, D. William. Distance Education for Elementary and Secondary Schools in the United States. International Journal of E-Learning & Distance Education / Revue internationale du e-learning et la formation à distance, [S. l.], v. 3, n. 2, p. 71–96, 1988. Disponível em: https://ijede.ca/index.php/jde/article/view/550. Acesso em: 1 may. 2024.