Hersi, Ali Abdirahman (1977) “The Arab factor in Somali History: The Origins and the development of Arab enterprise and cultural influences in the Somali Peninsula”, (Ph.D dissertation, University of California, Los Angeles).
Jama Mohamed (2002) Imperial Politics and Nationalism in the Decolonisation of Somaliland, 1954-1960. English Historical Review, 1177-1202. Oxford University Press.
David; Samatar, S. Said (1987) Somalia: Nation in Search of a State, Boulder, Colorado. Westview.
Lewis, I.M. (2002, 4th ed.) A Modern History of the Somali, Nation and State in the Horn of Africa, Woolnugh, Irthlingborough UK.
Lewis, I.M. (1994) Blood and Bone: The call of Kinship in Somali Society. Lawrenceville, NJ, Red Sea.
Lewis, I.M. (1961) A pastoral Democracy, London, Oxford University Press.
Lewis, I.M. (1969/1994) The People of the Horn of Africa Somali, Afar and Saho, London, International African Institute.
Lewis, I.M. (1990) “Somalia, Recent History” in Africa South of the Sahara. London, Europa Publications, pp 894-911.
Lewis, I.M (I998) Saints and Somalis: Popular Islam in a Clan Based Society, Lawrenceville, NJ, Red Sea.
Mohamed Ibrahim Mohamed (2000) Taariikhda Soomaaliya. Mogadishu.
Oliver, R. (1994) Islam in Ethiopia and the Horn & The revival of Muslim Power. In The Cambridge History of Africa, Vol. 3 pp 134-150, 164-177. Cambridge University Press.
Said Hamdun and Noel King, (1998) Ibna Battuta in Black Africa. Markus Wiener Publishers, Princeton.
Sharif Caydaruus b. Cali (1954) Baqiyatil Aamaal Fi Taariikhi Soomaali.
UNDP (2001) Human Development Report, Somalia. Nairobi, UNDP, Somali Country Office.