ZERVA, Konstantina; SANGWIN, Christopher; JONES, Ian; QUINN, David. Rejuvenating the HELM Workbooks as Online STACK Quizzes in 2020. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 17, n. 23, p. pp. 69–88, 2022. DOI: 10.3991/ijet.v17i23.35923. Disponível em: https://online-journals.org/index.php/i-jet/article/view/35923. Acesso em: 3 may. 2024.