MORRISON, Dirk. Using Activity Theory to Design Constructivist Online Learning Environments for Higher Order Thinking: A Retrospective Analysis. Canadian Journal of Learning and Technology, [S. l.], v. 29, n. 3, 2003. DOI: 10.21432/T2X01R. Disponível em: https://cjlt.ca/index.php/cjlt/article/view/26540. Acesso em: 7 apr. 2026.