Al Ward, Majed Ahmed, and Wan Ruslan Ismail. “Precipitation Analysis and Water Resource of Wadi Siham Basin, Yemen”. GEOGRAFI 7, no. 2 (October 18, 2019): 36–63. Accessed May 12, 2025. https://ejournal.upsi.edu.my/index.php/GEOG/article/view/2814.