John S. H. Tay; N. Saha (1988). "Genetic Heterogeneity Among the Negroid and Arab Tribes of the Sudan". American Journal of Physical Anthropology. 76 (2): 211–215. doi:10.1002/ajpa.1330760209. PMID3414791.
John S. H. Tay; N. Saha (1988). "Genetic Heterogeneity Among the Negroid and Arab Tribes of the Sudan". American Journal of Physical Anthropology. 76 (2): 211–215. doi:10.1002/ajpa.1330760209. PMID3414791.