| Gravina, Richard; Nelezek Barko, Robert; Tchalalao Abina, Robert | Mbuko lexicon | 2003 | | Linguistics |
| Boydell, Alan; Gravina, Richard; Doumok, Elie | Merey provisional lexicon | 2003 | | Linguistics |
| Gravina, Richard | The verb phrase in Merey | 2007 | | Linguistics |
| Gravina, Richard and others | L'orthographe de la langue Tchouvok, esquisse préliminaire | 2004 | | Literacy and Education |
| Golamadang, Thomas, Timothée Sabataï and Richard Gravina | L'orthgraphe de la langue guemzek | 2005 | | Literacy and Education |
| Giger, Martha; Gravina, Richard; Haller, Beat; Lawarum, Ayouba; Boumbouloh, Jean; Doumok, Elie | Sənəkwakwa ha bo ka mədzeŋge 3 | 2001 | | |
| Gravina, Richard; Gravina, Susan; Nelezek Barko, Robert | Wan ana ayah (L'écureuil) | 2001 | | |
| Gravina, Richard | The Verb Phrase in Mbuko | 2001 | | Linguistics |
| Calalaw, Robert; Gravina, Richard; Gravina, Susan; Nelezek Barko, Robert | Lǝbara cǝɗew aya awan | 1999 | | |
| Gravina, Richard | Proto-Central Chadic Reconstructions | 2015 | | Linguistics |
| Gravina, Richard | The phonology of Mbuko | 1999 | | Linguistics |
| Gravina, Richard; Nelezek Barko, Robert | Ləbara sə Mahamet Wundala | 1999 | | |
| Gravina, Richard | The vowel system of Mbuko | 1997 | | Linguistics |
| Gravina, Richard; Doumok, Elie | L'orthographe de la langue mere (Description préliminaire) | 2001 | | Literacy and Education |
| Gravina, Richard; Gravina, Susan | Dictionnaire Mbuko | 2016 | | Linguistics |
| Gravina, Richard | Topic and Focus in Mbuko Discourse | 2000 | | Linguistics |
| Gravina, Richard | The Use of Additive Particles in Mbuko Discourse | 2000 | | Linguistics |
| Gravina, Richard | Proto-Central Chadic Dictionary | 2015 | | Linguistics |
| Lovestrand, Joseph; Olson, Emily; Gravina, Richard | Dictionnaire Mbuko - français - anglais | 2022 | | Linguistics |
| Gravina, Richard | Merey lexicon | 2003 | | Linguistics |
| Gravina, Richard; Nelezek Barko, Robert; Tchalalao Abina, Robert | Mbuko - French - English lexicon | 2003 | | Linguistics |
