S. El-Safty and K. M. Mahrose, “Evaluation of Some Phenotypic, Physiological and Egg Quality Traits of African Black Neck Ostrich under Arid Desert Conditions of Libya”, Int. J. Poult. Sci., vol. 8, no. 6, pp. 553–558, May 2009, doi: 10.3923/ijps.2009.553.558.