Further to ‘Off to Somalia? Here’s Some Preparatory Reading’, here are additional suggestions from Max’ed Cumar/@samadoon:

• Mohamed Haji Mukhtar, ‘Historical Dictionary of Somalia’
• Michael van Notten, ‘Law of the Somalis: A Stable Foundation for Economic Development in the Horn of Africa’ (no e-book available but the Amazon link is here) 
• Ali Jimale Mohamed, ‘DAybreak is Near : Literature, Clans and the Nation-State in Somalia: Literature, Clans and the Nation-state of Somalia’ (Amazon link here)
• I M Lewis, ‘A Pastoral Democracy: Study of Pastoralism and Politics Among the Northern Somali of the Horn of Africa’ (Amazon link here)
• Lidwien Kaptjiens, ‘Women’s Voices in a Man’s World: Women and the Pastoral Tradition in Northern Somali Orature’ (Amazon link here)

Other suggestions most welcome.