Routledge · School of Oriental & African Studies
| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Omotic Language Studies | 978-0-7286-0166-6 | 1990 | |
| The Challenge of Omotic: An Inaugural Lecture Delivered on 17 February 1994 | 978-0-7286-0249-6 | 1995 | |
| Voice and Power | 978-0-367-08845-3 | 2018 | |
| Voice and Power: Culture of Language in North-east Africa - Essays in Honour of B.W.Andrzejewski | 978-0-7286-0257-1 | 1996 | I. M. Lewis |