Gwich'in ( gwichin , kutchin,tukudh )
Gwich'in ( gwichin , kutchin,tukudh ) Wikipedia
Gwich'in ( gwichin , kutchin,tukudh ) native-languages.org
A grammar of the Tukudh language (1911) by McDonald, Archdeacon, 1829-1913 . Archive.org
Chilig Takudh tshah zit: Hymns in Takudh language (1889) by McDonald . Archive.org