Poorfaraj, Alireza, and Hadi Keshavarz . “Knowledge and Economic Growth: Evidence from Some Developing Countries”. Journal of Education and Vocational Research 1, no. 1 (November 4, 2011): pp. 21-25. Accessed July 22, 2024. https://ojs.amhinternational.com/index.php/jevr/article/view/4.