| Ngang, David | Les pronoms en karang (ALCAM 352) | 1999 | | Linguistics |
| 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 | | |
| Équipe de traduction du Centre de Littérature Karang | Mahful laɓ pihna ke sąwkpuh pambe | 1998 | | |
| Ubels, Virginia | Testing a primer series | 1986 | Notes on Literacy (online collection) | Literacy and Education |
| 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 | | |
| Ubels, Edward H | Mood and aspect in Karang | 1983 | Studies in African Linguistics | Linguistics |
| Ulfers, Robert | Dictionnaire Karang | 2019 | | Linguistics |
| Seguin, Lawrence Marc | The Eastern Mbum Survey: An Assessment of the Extendability of Current Language Development Projects | 2012 | Journal of Language Survey Reports | Language Assessment, Sociolinguistics |
| Seguin, Lawrence M | The Eastern Mbum survey: An assessment of the extendability of current language development projects | 1991 | | Language Assessment, Sociolinguistics |
