Classification
- WALS
- TK > Kam Tai
- Glottolog
- Tai Kadai > Kam Tai > Daic Beic > Daic > Northerndaic Sek
- Ethnologue
- Kra Dai > Kam Tai > Tai > Northern
Sources
- Peiros 1998
- Comparative Linguistics in Southeast Asia. Pacific Linguistics C-142. Canberra: Australian National University.