| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Igbo Language Course | 978-0-19-639494-7 | 1971 | Margaret Mackeson Green |
| Igbo Language Course: Bk. 1 | 978-0-19-639410-7 | 1967 | " |
| Igbo Language Course: Bk. 2 | 978-0-19-639411-4 | 1967 | " |
| Short Igbo Grammar | 978-0-19-639228-8 | 1965 | " |