Awad, Z. E., and Z. O. Gaafer. “Examining Sustainable Mobility in Low-Cost Neighborhoods in Khartoum-Sudan”. European Journal of Sustainable Development 7, no. 3 (October 1, 2018): 301. Accessed February 5, 2023. http://ojs.ecsdev.org/index.php/ejsd/article/view/723.