"Evaluation of Sana’a Wastewater Treatment Plant: Problem Analysis and Suggested Results". Hadhramout University Journal of Natural & Applied Sciences 16, no. 2 (ديسمبر 6, 2023). تاريخ الوصول يوليو 28, 2026. https://hu.edu.ye/hu-publications/journals/index.php/hujnas/article/view/180.