There are many books published in Arabic and Somali language discussing Somali history written by Somali authors who particularly share important details , struggles, developments, travels of people in the region and even reference local private sources and diaries and other external arabic sources . Because they published mainly in Arabic and Somali languages their contributions are not widely seen or available as opposed those written in English which is a shame really because they contain a wealth of information
One i am reading right now is.
The History of Somali Scholars by Mohamed Hussein Ma'alim
The earlier Arabic version of it:
In it he refrences two important Arabic works by Somali scholars:
Tarikh al-Sumal fi al-Usur Wusta Wa-al Haditha (The Modern and Medieval History of Somalia) by Aw Jama Umar Issa
And
Kashf al-Sudul An Tarikh al-Sumal Wa-Mamalikihim al-Sab'ah (The History of Somalia and the Seven Muslim Kingdoms) by Shaykh Ahmad Abdallah in reference to the medieval polities in the horn interior.
Among the slew of other sources and refrences by the ulema.