Omontese, B.O., P.I. Rekwot, I.U. Ate, J.S. Rwuaan, H.J. Makun, R.A. Mustapha, and M. Lawal. 2012. “Use of Ultrasonography for Pregnancy Diagnosis in Red Sokoto Goats”. Scientific Journal of Biological Sciences 1 (5):101-6. http://sjournals.com/index.php/sjbs/article/view/1113.