سهير محمد أحمد محمود and أشرف محمد أحمد علي (2021) “IQ of identical and non-identical twins (Field study in Khartoum State)”, University of Sinnar Journal for Human Sciences, 2(1). Available at: http://ojs.uofs.edu.sd/index.php/SiOJSHS/article/view/25 (Accessed: 23 November 2024).