^Yei at Ethnologue (18th ed., 2015) (subscription required)
^Evans, Nicholas (2018). "The languages of Southern New Guinea". In Palmer, Bill (ed.). The Languages and Linguistics of the New Guinea Area: A Comprehensive Guide. The World of Linguistics. Vol. 4. Berlin: De Gruyter Mouton. pp. 641–774. ISBN978-3-11-028642-7.
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