MASTERS, Y. .; GREGORY, S. .; GRONO, S. . PST Online: Meeting the Need for Teaching Innovation for Virtual Schools. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 14, n. 2, p. 1–16, 2015. Disponível em: https://ijlter.myres.net/index.php/ijlter/article/view/984. Acesso em: 21 jun. 2026.