(en) Gratien Gualbert Atindogbe, Standardization and harmonization of Cameroonian languages, Cape Town, Centre for Advanced Studies of African Society (CASAS), (ISBN1-919799-93-1)
(en) Willi Schaub, Alphabet of the Babungo language, Yaoundé, SIL,
(bav) Willi Schaub, Ŋwa’le Məzwetə I maa Ghaŋ Vəŋoo (Syllabaire en langue babungo), Yaoundé, SIL,