"Assessment of Bacteriological Quality of Drinking Water in Some Primary and Secondary Schools in Mukalla City-Hadhramout Yemen". Hadhramout University Journal of Natural & Applied Sciences 16, no. 2 (نوفمبر 26, 2023). تاريخ الوصول يوليو 29, 2026. https://hu.edu.ye/hu-publications/journals/index.php/hujnas/article/view/116.