John S. H. Tay; N. Saha. Genetic Heterogeneity Among the Negroid and Arab Tribes of the Sudan. American Journal of Physical Anthropology. 1988, 76 (2): 211–215. PMID 3414791. doi:10.1002/ajpa.1330760209.
John S. H. Tay; N. Saha. Genetic Heterogeneity Among the Negroid and Arab Tribes of the Sudan. American Journal of Physical Anthropology. 1988, 76 (2): 211–215. PMID 3414791. doi:10.1002/ajpa.1330760209.