Popescu, A.I. (2012) „Lifelong Learning in the Knowledge Economy: Considerations on the Lifelong Learning System in Romania from a European Perspective”, Revista de Cercetare si Interventie Sociala, 37, pp. 49–76. Disponibil la: https://www.rcis.ro/journal/article/view/421-lifelong-learning-in-the-knowledge-economy-considerations (Data accesării: 7 noiembrie 2026).