Source: Onishi (2004)
Onishi, Masayuki. 2004. "Papuan languages of South Bougainville: Present and Future". In Shibata Norio & Toru Shionoya (eds.), Kan minami Taiheiyoo no gengo 3 [Languages of the South Pacific Rim 3] (ELPR Publications Series A1-008). pp. 119-134. Suita: Faculty of Informatics, Osaka Gakuin University.