P. M. Kgwatalala, P. Segokgo, and E. Simon, “Comparative Growth Performance of Cross-Bred (50% Orpington: 25% Australorp: 25% Tswana) and Pure-Bred Tswana Chickens under an Intensive Management System”, Int. J. Poult. Sci., vol. 14, no. 2, pp. 63–66, Jan. 2015, doi: 10.3923/ijps.2015.63.66.