" Anaerobic Composting of Farmyard Manure As Affected by Chicken Manure, Urea and Waste Water". University of Khartoum Journal of Agricultural Sciences 23, no. 2 (مارس 28, 2023). تاريخ الوصول أغسطس 4, 2026. https://onlinejournals.uofk.edu/uofkjas/article/view/1803.