The writing of the Somali language : a great landmark in our revolutionary history. Somalia Wasaaradda Warfaafinta iyo Hanuuninta Dadweynaha [Ministry of Information and National Guidance] (ภาษาอังกฤษ). Mogadishu. 1974. p. 5. OCLC2134491.
Economist Intelligence Unit (Great Britain) (1975). Middle East annual review. Saffron Walden: World of Information. p. 229. ISSN0305-3210. OCLC715562258.