DE LANGEN, F.H.T. Strategies for sustainable business models for open educational resources. The International Review of Research in Open and Distributed Learning, [S. l.], v. 14, n. 2, p. 53–66, 2013. DOI: 10.19173/irrodl.v14i2.1533. Disponível em: https://www.irrodl.org/index.php/irrodl/article/view/1533. Acesso em: 24 feb. 2024.