AlFreijat, Saleh. “Estimating the Optimal Size of the Tax Burden in Jordan Using the Laffer Curve During the Period (2020-1980)”. Al-Balqa Journal for Research and Studies 24, no. 2 (December 31, 2021): 126–139. Accessed October 10, 2026. https://ajrs.ammanu.edu.jo/ojs/index.php/albalqajournal/article/view/128.