PARK, Kyunghee; LI, He; LUO, Nan. Key Issues on Informal Learning in the 21st Century: A Text Mining-based Literature Review. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 16, n. 17, p. pp. 4–18, 2021. DOI: 10.3991/ijet.v16i17.23663. Disponível em: https://online-journals.org/index.php/i-jet/article/view/23663. Acesso em: 1 may. 2024.