Donohue (2004), p. 33. Donohue, Mark (2004). "The pretenders to the Muna-Buton group". In Bowden, J.; Himmelmann, N. (eds.). Papers in Austronesian subgrouping and dialectology. Pacific Linguistics 563. Canberra: Australian National University. pp. 21–36. doi:10.15144/PL-563.21. hdl:1885/146183.
Mead (2003), p. 135. Mead, David (2003). "Evidence for a Celebic supergroup". In Lynch, John (ed.). Issues in Austronesian historical phonology. Pacific Linguistics 550. Canberra: Australian National University. pp. 115–141. doi:10.15144/PL-550.115. hdl:1885/146173.
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Wolio at Ethnologue (18th ed., 2015) (subscription required)
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Donohue (2004), p. 33. Donohue, Mark (2004). "The pretenders to the Muna-Buton group". In Bowden, J.; Himmelmann, N. (eds.). Papers in Austronesian subgrouping and dialectology. Pacific Linguistics 563. Canberra: Australian National University. pp. 21–36. doi:10.15144/PL-563.21. hdl:1885/146183.
Mead (2003), p. 135. Mead, David (2003). "Evidence for a Celebic supergroup". In Lynch, John (ed.). Issues in Austronesian historical phonology. Pacific Linguistics 550. Canberra: Australian National University. pp. 115–141. doi:10.15144/PL-550.115. hdl:1885/146173.