Alilah Al-Zubaidi, A., عبد, M. Alrashed, محمود, O. Abdel Aziz, and اسامة. “Study of Parents Influence on Some Productive Features of Friesian Cows”. Journal of Education and Science (JES), vol. 17, no. 2, June 2005, pp. 109-14, doi:10.33899/edusj.2005.81118.