Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson, eds. Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. 2005. ISBN 0858835622. OCLC 67292782.
Ray, Sidney Herbert. The languages of British New Guinea. Transactions of the Ninth International Congress of Orientalists. 1892,. II (1892): 754–770.