BÎRSAN, Dan Cătălin. Industry 4.0 and the Imperative of Professional Retraining: Non-Formal Digital Learning for the Manufacturing Workforce. Journal of Non-Formal and Digital Education, [S. l.], v. 2, n. 1, p. 46–51, 2026. DOI: 10.63734/JNFDE.02.01.007. Disponível em: https://journals.team4excellence.ro/journal-of-non-formal-education/article/view/61. Acesso em: 7 jul. 2026.