Phillipson (2009). "The First Millennium BC in the Highlands of Northern Ethiopia and South–Central Eritrea: A Reassessment of Cultural and Political Development". African Archaeological Review. 26 (4): 257–274. doi:10.1007/s10437-009-9064-2. S2CID154117777.
Phillipson (2009). "The First Millennium BC in the Highlands of Northern Ethiopia and South–Central Eritrea: A Reassessment of Cultural and Political Development". African Archaeological Review. 26 (4): 257–274. doi:10.1007/s10437-009-9064-2. S2CID154117777.