"Comparison and Effects of Compaction Methods on Gradation and Strength of Natural Unbound Materials". University of Khartoum Engineering Journal 3, no. 2 (نوفمبر 6, 2022). تاريخ الوصول يوليو 8, 2026. https://onlinejournals.uofk.edu/kuej/article/view/1076.