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| Ali, Mohammed, Andrzej Zaborski 1990. Handbook of the Oromo Language. Wrocław et al.: Zakład Narodowy Imienia Ossolińskich; (relevant pages: 17-18; 23; 77-78) |
| Kiyomi, Setsuko 1995. "A new approach to reduplication: a semantic study of noun and verb reduplication in the Malayo-Polynesian languages". In Linguistics 33: 1145-1167 |
| Owens, Jonathan 1985. A Grammar of Harar Oromo (Northeastern Ethiopia). Hamburg: Helmut Buske Verlag; (relevant pages: 19; 84-85; 93) |
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