Mr. Abdirashid Adam Isak, and Dr. Mohammed Mubarek Awad. “Determination of Lead Levels in Soil for Some Areas at East Gezira And Khartoum - Sudan, Africa”. Global Journal of Science Frontier Research 19, no. B2 (May 15, 2019): 27–32. Accessed April 28, 2024. https://journalofscience.org/index.php/GJSFR/article/view/2485.