^Maklew at Ethnologue (8th ed., 1974). Note: Data may come from an earlier edition.
^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. ISBN 978-3-11-028642-7.