| Tchalalao Abina, Robert | Ləbara ahay 2 | 2005 | | |
| Calalaw, Robert; Gravina, Richard; Nelezek Barko, Robert | Lǝbara zǝbor aya awan | 2000 | | |
| Nelezek Barko, Robert | Ləbara ahay 1 | 2005 | | |
| Gravina, Richard | Mbuko Provisional Orthography | 1998 | | Linguistics |
| Gravina, Richard and Robert Nelezek | Avinde ʼam sǝ mbuko | 1999 | | Literacy and Education |
| Gravina, Richard | The phonological structure of Mbuko | | | Literacy and Education |
| Gravina, Richard | Features of a Chadic language: the case of Mbuko phonology | 2001 | Grammatische analysen Afrikanischer Sprachen | Linguistics |
| Gravina, Richard; Gravina, Susan; Nelezek Barko, Robert | 'Am sə guvugo ahay mə slala cew awan (Deuxième livret de contes) | 2001 | | |
| Gravina, Richard; Nelezek Barko, Robert | ʼAm sǝ guvugo ahay mamaʼam awan | 1999 | | |
