RICHARDSON, Jennifer C; KOEHLER, Adrie A.; BESSER, Erin D.; CASKURLU, Secil; LIM, JiEun; MUELLER, Chad M. Conceptualizing and investigating instructor presence in online learning environments. The International Review of Research in Open and Distributed Learning, [S. l.], v. 16, n. 3, 2015. DOI: 10.19173/irrodl.v16i3.2123. Disponível em: https://www.irrodl.org/index.php/irrodl/article/view/2123. Acesso em: 28 mar. 2024.