Olukole, S. G., and B. O. Oke. “Structure of the Leydig Cell in the African Sideneck Turtle (Pelusios Castaneus)”. Sahel Journal of Veterinary Sciences, vol. 17, no. 2, June 2020, pp. 19-25, https://www.demo.saheljvs.org/index.php/saheljvs/article/view/103.