Babiker, M., Tawfeig, A., Yahia, I., & Noura, K. (2009). Mortality and Diseases Status in Layer Chicken Flocks Reared in Traditional Farms in Khartoum-Sudan. International Journal of Poultry Science, 8(3), 264–269. https://doi.org/10.3923/ijps.2009.264.269