Obidi, J.A., B.I. Onyeanusi, J.O. Ayo, P.I. Rekwot, and T. Dzenda. 2008. “Determination of Gonadal Sperm Spermatid Reserves in Shikabrown Breeder Cocks”. International Journal of Poultry Science 7 (12): 1200–1203. https://doi.org/10.3923/ijps.2008.1200.1203.