Rüdiger Köppe · Spoken Language Services
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Historical Language Contact in Africa | 978-3-89645-091-3 (3-89645-091-3) | 2001 | Bruce Connell · Gerrit J. Dimmendaal · Christopher Ehret · Mary Esther Kropp Dakubu · Deo S. Ngonyani · Anthony Traill · Benji Wald | |
| Spoken Hausa | 978-0-87950-401-4 (0-87950-401-3) | 1976 | J. Ronayne Cowan |