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1 2 3 Nadia Durrani, The Tihamah Coastal Plain of South-West Arabia in its Regional context c. 6000 BC - AD 600 (Society for Arabian Studies Monographs No. 4) . Oxford: Archaeopress, 2005, p. 121.
↑ Kitchen, Andrew, Christopher Ehret, et al. 2009. "Bayesian phylogenetic analysis of Semitic languages identifies an Early Bronze Age origin of Semitic in the Near East." Proceedings of the Royal Society B: Biological Sciences 276 no. 1665 (June 22)
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↑ Phillipson. "The First Millennium BC in the Highlands of Northern Ethiopia and South–Central Eritrea: A Reassessment of Cultural and Political Development". African Archaeological Review (2009) 26:257–274