| Ngang, David; Ulfers, Robert | A practical study of the orthography of compound words in the Karang language (ALCAM 352) | 2000 | | Literacy and Education |
| Ulfers, Robert Ernst, compiler | Dictionnaire karang - français | 2007 | | Linguistics |
| Ngang, David; Ulfers, Robert | Mbete firma fe ke nzak karaŋ 1 ke 2 (Présyllabaires volumes 1 et 2 en langue karang) | 1998 | | |
| Ulfers, Robert | Narrative genre text collection for discourse grammar analysis in Karang | 1993 | | Linguistics |
| L'équipe de traduction du Centre de Littérature Karang | Zaneɗ ke Sena Ndariya | 1998 | | |
| Ulfers, Robert | Dictionnaire Karang | 2019 | | Linguistics |
