U. Haruna, S. Jibril, D. Kalla, and H. Suleiman, “Evaluation of Egg Production in Jos North Local Government Area, Plateau State, Nigeria”, Int. J. Poult. Sci., vol. 6, no. 8, pp. 604–607, Jul. 2007, doi: 10.3923/ijps.2007.604.607.