فتاح عبد الجبار محمود, and احمد داود عبدالجبار. “The History of Rational Thought for the Investment by Human Capital and the Investing in It”. Journal of Economics and Administrative Sciences 24, no. 103 (April 1, 2018): 317. Accessed April 3, 2025. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/115.