| Ubels, Edward H. and Virginia Ubels | Phonology of Karang | 1980 | | Linguistics |
| Ngang, David | Máhfúl hí sąwkpùh zɔ̀ke hi gun ké zɔ̀k ké ɓíl púh | 1994 | | |
| Ubels, Virginia; Yapélé, Jean-Pierre | Boro kè Bɔ̌kɔ: Mbete fírma fè kè nzák karang 6 | 1985 | | |
| Dingaoutar, Esaïe | Ndeɓay ke yim argi = Ndebaï et l’Arki | 2001 | | |
| Ubels, Virginia; Yapélé, Jean-Pierre | Gama kè Kudu: Mbete fírma fè kè nzák karang 3 | 1985 | | |
| Ngang, David; Ubels, Virginia; Ulfers, Robert; Yapélé, Jean-Pierre | Mbete firma fe ke nzak karaŋ 5 (Syllabaire volume 5 en langue karang) | 2001 | | |
| Ubels, Virginia; Yapélé, Jean-Pierre | Mbete firma fe ke nzak karaŋ 3 | 1998 | | |
| Ubels, Virginia; Yapélé, Jean-Pierre | Bɔ̌kɔ kè Kuɗu: Mbete fírma fè kè nzák karang 5 | 1985 | | |
| Ubels, Edward H.; Yapélé, Jean-Pierre | Mbete túku 1, 2 | 1984 | | |
| Ngang, David; Ubels, Virginia; Ulfers, Robert; Yapélé, Jean-Pierre | Mbete firma fe ke nzak karaŋ 6 (Syllabaire volume 6 en langue karang) | 2001 | | |
| Tadadjeu, Maurice | Alphabets of Cameroon – Country Introduction from Alphabets of Africa | 1993 | | Literacy and Education |
| Ubels, Virginia | Alfabe karaŋ | 1986 | | |
| Ubels, Edward H.; Ubels, Virginia; Yapélé, Jean-Pierre | Lisons et écrivons la langue karang | 1982 | | |
| Ubels, Edward H.; Ubels, Virginia; Yapélé, Jean-Pierre | Jaŋgen e mbinden wolde karaŋ | 1982 | | |
| Ubels, Virginia; Yapélé, Jean-Pierre | Mbete firma fe ke nzak karaŋ 4 | 1998 | | |
| Yapélé, Jean-Pierre | Ɓày fè láɓna karaŋrì lew sá | 1982 | | |
| Ubels, Virginia; Yapélé, Jean-Pierre | Yóro kè Dìla: Mbete fírma fè kè nzák karang 4 | 1985 | | |
| Ubels, Virginia | Mbete fírma fè kè nzák karaŋ 2 | 1984 | | |
| Ubels, Virginia | Mbete píhna nzùk sɔ́k fè kína | 1986 | | |
| Ubels, Virginia | Mbete fírma fè kè nzák karaŋ 1 | 1984 | | |
| Souman, Philémon; Ubels, Virginia | Mbete sɔ́k ɓày séna | 1986 | | |
