Mdanat, M. F., T. A. Warrad, L. M. Salhieh, and T. S. Arabiyat. “A Gravity Approach to Determinants of Export in a Small Open Economy: ‎Evidence from Jordan”. International Journal of Economics and Financial Issues, vol. 8, no. 2, Mar. 2018, pp. 40-46, https://econjournals.com/index.php/ijefi/article/view/6003.