COSTLEY, J. . The Effects of Three Types of Instructor Posting on Critical Thinking and Social Presence: No Posting, Facilitating Discourse, and Direct Instruction. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 12, n. 2, p. 26–47, 2015. Disponível em: http://www.ijlter.net/index.php/ijlter/article/view/1055. Acesso em: 20 apr. 2026.