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Holton, Gary; Klamer, Marian (2018). "The Papuan languages of East Nusantara and the Bird's Head". 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. 569–640. doi:10.1515/9783110295252-005. ISBN978-3-11-028642-7. OCLC1041880153.
Reesink, Ger P. (1998). "The Bird's Head as Sprachbund". In Miedema, Jelle; Odé, Cecilia; Dam, Rien A.C. (eds.). Perspectives on the Bird‘s Head of Irian Jaya, Indonesia; Proceedings of the Conference, Leiden, 13–17 October 1997. Amsterdam/Atlanta: Rodopi. pp. 603–642. doi:10.1163/9789004652644_032. ISBN978-9-042-00644-7. OCLC41025250.