UNESCO Institute for Lifelong Learning (UIL) (Germany), Yang, J., & Valdes-Cotera, R. (2011). Conceptual evolution and policy developments in lifelong learning. UNESCO Institute for Lifelong Learning (UIL).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)UNESCO Institute for Lifelong Learning (UIL) (Germany), Jin Yang, و Raul Valdes-Cotera. Conceptual Evolution and Policy Developments in Lifelong Learning. Hamburg, Germany: UNESCO Institute for Lifelong Learning (UIL), 2011.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)UNESCO Institute for Lifelong Learning (UIL) (Germany), et al. Conceptual Evolution and Policy Developments in Lifelong Learning. UNESCO Institute for Lifelong Learning (UIL), 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.