| Boutwell, Katrina; Boutwell, Richard L. | Mungong Orthography Guide | 2011 | | Literacy and Education |
| Boutwell, Katrina; Boutwell, Richard L. | Nchane orthography guide | 2008 | | Literacy and Education |
| Langhout, Bep, Richard L. Boutwell, Aku Julius Eyoh and Robert Hedinger | Sari Orthography Guide | 2022 | | Linguistics, Literacy and Education |
| Mkounga Tala Blaise, Katrina L. Boutwell and Richard L. Boutwell | Mungong Orthography Guide | 2022 | | Linguistics, Literacy and Education |
| Boutwell, Katrina; Boutwell, Richard L.; Zubot, Esther | Nchane Orthography Guide | 2021 | | Linguistics, Literacy and Education |
