| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| In Tongues: African Languages and the Challenges of Development | 978-1-919799-15-5 (1-919799-15-X) | 1998 |
| Multilingualism: An African Advantage: A Paradigm Shift in African Language of Instruction Policies | 978-1-920447-30-4 (1-920447-30-X) | 2009 |
| The Role of Missionaries in the Development of African Languages | 978-1-920447-28-1 (1-920447-28-8) | 2009 |