- Egbunike, G.N. and J.T. Williams. 2005. Utilization of crude testis extracts to enhance broiler production in the humid tropics. ASSET In press). www.uco.es/organiza/servicios/…/16_14_22_03InfluenceEgbunike.pdf
- DIPEOLU, M.A., ERUVBETINE, D. and WILLIAMS, T.J. (1996) Indigenous chicken rearing under village conditions. International Journal of Animal Sciences 11: www.journals.cambridge.org/production/action/cjoGetFulltext?fulltextid
