| Boyd, Ginger | Précis d'orthographe de langue numála | 2009 | | Literacy and Education |
| Harvey, Bradley S.; Harvey, Tammie M.; Grant, Caroline | Dialect intelligibility testing among Central Yambasa speech varieties | 1992 | | Language Assessment, Sociolinguistics |
| Bebiyeme, Raymond; Bagoña, Angéline; Ombiono, Jean | Nsɛ dianɔna diɔŋɔ numála | 2009 | | |
| Boone, Douglas W., David P. Bradley and Caroline A. Grant | Central Yambasa survey report | 1999 | Journal of Language Survey Reports | Language Assessment, Sociolinguistics |
| Boyd, Ginger; Roberts, David | La contribution de la graphie tonale à la fluidité de la lecture orale : les cas de l’elip, du mmala et du yangben au Cameroun | 2018 | | Linguistics, Literacy and Education |
| Boyd, Ginger | The phonological systems of the Mbam languages of Cameroon with a focus on vowels and vowel harmony | 2015 | LOT dissertations | Linguistics |
| Bebiyeme, Raymond; Kiole, Frédéric | Nsɛ dɛfɔ́nfɔn dɛbanan diɔŋɔ numaala (Apprenons, lisons et écrivons le numaala) | 2007 | | |
| Bebiyeme, Raymond; Kiole, Frédéric | Mbɔbɔnɔ ya duful dá numaala | 2007 | | |
| Boyd, Ginger | Dictionnaire Mmala (Numala) | 2016 | | Linguistics |
| Boyd, Ginger; Reeder, JeDene; Roberts, David | Elip, Mmala and Yangben | 2021 | Studies in Written Language and Literacy | Linguistics, Literacy and Education |
| Akegne, Moise; Ombiono, Jean; Aŋuaŋa, Thomas; Batabaka, Jean-Marie; Babissakana | Nsɛ dɛfɔ́nfɔn dɛbanan diɔŋɔ numála | 2009 | | |
