Obike, O.M., U.K. Oke, and K.E. Azu. 2011. “Comparison of Egg Production Performance and Egg Quality Traits of Pearl and Black Strains of Guinea Fowl in a Humid Rain-Forest Zone of Nigeria”. International Journal of Poultry Science 10 (7): 547–551. https://doi.org/10.3923/ijps.2011.547.551.