References
- Campbell, Lyle, and Veronica Grondona (eds.). 2012. The indigenous languages of South America: A comprehensive guide. Berlin: Mouton de Gruyter.
- Fenwick, Rohan S. H. 2011. A grammar of Ubykh. Munich: Lincom Europa.
- Koch, Harold, and Rachel Nordlinger (eds.). 2014. The languages and linguistics of Australia: A comprehensive guide. Berlin: Mouton de Gruyter.
- Palmer, Bill. 2017. The languages and linguistics of the New Guinea area: A comprehensive guide. Berlin: Mouton de Gruyter.
- Salminen, Tapani. 2002. Problems in the taxonomy of the Uralic languages in the light of modern comparative studies. Lingvisticheskij bespredel: sbornik statej k 70-letiju A. I. Kuznetsovoj. 44–55.
- SIL International. 2015. ISO 639-3 registration authority. Online: http://www-01.sil.org/iso639-3.