Tech. Suhaila Juma Radi, Asst. Tech. Afrah Oudah Sabeeh, and Prof. Dr. Safaa Mohammed Hadi. “USING WAITING LINES THEORY TO SOLVE THE PROBLEM OF WAITING A CASE STUDY IN THE NATIONAL BANK OF IRAQ”. World Economics and Finance Bulletin, vol. 19, Feb. 2023, pp. 183-91, https://scholarexpress.net/index.php/wefb/article/view/2247.