Rafiu, T. A. “Performance and Egg Quality of Laying Birds Fed Varying Levels of Oil Palm Slurry-Wheat Offal Meal Based Diets”. International Journal of Livestock Research, vol. 9, no. 4, Apr. 2019, pp. 25-31, https://ijlr.org/ojs_journal/index.php/ijlr/article/view/1292.