Farag F Abushanaf, Bashir A Nwer, و Mukhtar Mahmud Elaalem. "Mapping Soil PH and Electrical Conductivity Using Simple Kriging and Ordinary Kriging in Jeffara Plain Region". Bani Waleed University Journal of Humanities and Applied Sciences 9, no. 5 (ديسمبر 1, 2024): 382–395. تاريخ الوصول أكتوبر 6, 2025. https://jhas-bwu.com/index.php/bwjhas/article/view/602.