ARVAN, Lanny. The Economics of ALN: Some Issues. Online Learning, Boston, MA, v. 1, n. 1, 1997. DOI: 10.24059/olj.v1i1.1937. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1937. Acesso em: 17 aug. 2026.