“Rainwater Drainage Service Improvement Using a Number Of Quality Tools at the Directorate of Karbala Sewage”. Journal of Economics and Administrative Sciences 26, no. 119 (April 30, 2020): 83–102. Accessed May 2, 2024. https://jeasiq.uobaghdad.edu.iq/index.php/JEASIQ/article/view/1873.