HULT, Agneta; DAHLGREN, Ethel; HAMILTON, David; SÖDERSTRÖM, Tor. Teachers’ Invisible Presence in Net-based Distance Education. The International Review of Research in Open and Distributed Learning, [S. l.], v. 6, n. 3, 2006. DOI: 10.19173/irrodl.v6i3.262. Disponível em: https://www.irrodl.org/index.php/irrodl/article/view/262. Acesso em: 25 aug. 2024.