Persson, Andrew M. and Persson, Janet R. 1991. Mödö-English dictionary with grammar. (Bilingual Dictionaries of Sudan, 1.) 1st edn. Nairobi: Sudan: Summer Institute of Linguistics.
Persson, Janet. 2004. Bongo-Bagirmi languages in Sudan. Occasional Papers in the Study of Sudanese Languages 9. 77-84.