ONLINEThe Language of Niuafo'ou Island. Tsukamoto, Akihisa. 1988. WALS Online RefDB.
oai:refdb.wals.info:5728
The Oceanic languages. Lynch, John, 1946-. 2002. Curzon language family series ; 1.
oai:gial.edu:26697
ONLINENiuafo’ou: a language of Tonga. n.a. 2018. SIL International.
oai:ethnologue.com:num
ONLINELINGUIST List Resources for Niuafo'ou. Damir Cavar, Director of Linguist List (editor); Malgorzata E. Cavar, Director of Linguist List (editor). 2017-09-27. The LINGUIST List (www.linguistlist.org).
oai:linguistlist.org:lang_num
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http://www.language-archives.org/language.php/num
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