HASAN, Helen. Integrating IS and HCI Using Activity Theory as a Philosophical and Theoretical Basis. Australasian Journal of Information Systems, Australia, v. 6, n. 2, 1999. DOI: 10.3127/ajis.v6i2.305. Disponível em: https://ajis.aaisnet.org/index.php/ajis/article/view/305. Acesso em: 25 dec. 2025.