Khaliifa Jabr el Dar. 2006. "Towards a General Orthography of the Ajang Languages." In Insights into Nilo-Saharan Language, History and Culture: Proceedings of the 9th Nilo-Saharan Linguistic Colloquium, Institute of African and Asian Studies, University of Khartoum, 16-19 February 2004, edited by Al-Amin Abu-Manga et al. 23: 183-198. Köln: Rüdiger Köppe.