Sultana, N., N. Hassan, M. Ershaduzzaman, M. A. I. Talukder, and A. Iqbal. “Effect of Intensive and Semi-Intensive Feeding System on Productive and Reproductive Performances of Native Sheep”. Journal of Scientific Research, vol. 3, no. 3, Aug. 2011, pp. 693-8, doi:10.3329/jsr.v3i3.7129.