Ahmad, Abdussamad H. (1999). "Trading in Slaves in Bela-Shangul and Gumuz, Ethiopia: Border Enclaves in History, 1897–1938". The Journal of African History. 40 (3): 433–446. doi:10.1017/S0021853799007458. JSTOR183622. S2CID161799739.
Ahmad, Abdussamad H. (1999). "Trading in Slaves in Bela-Shangul and Gumuz, Ethiopia: Border Enclaves in History, 1897–1938". The Journal of African History. 40 (3): 433–446. doi:10.1017/S0021853799007458. JSTOR183622. S2CID161799739.
Ahmad, Abdussamad H. (1999). "Trading in Slaves in Bela-Shangul and Gumuz, Ethiopia: Border Enclaves in History, 1897–1938". The Journal of African History. 40 (3): 433–446. doi:10.1017/S0021853799007458. JSTOR183622. S2CID161799739.