Khelghat-Doost, Hamoon, and Suzyrman Sibly. “Human Capital for Sustainable Development: A Conceptual Framework for Institutes of Higher Education”. International Journal of Academic Research in Progressive Education and Development 9, no. 2 (March 30, 2020). Accessed October 14, 2025. https://ijarped.com/index.php/journal/article/view/2315.