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