# Bengtson, John D. (2008), "Materials for a Comparative Grammar of the Dene–Caucasian (Sino-Caucasian) Languages.
=== Тон ===# Bengtson, John D. (2008), «Materials for a Comparative Grammar of the Dene-Caucasian (Sino-Caucasian) Languages.» "Aspects of Comparative Linguistics", vol.