Tuite, Kevin. (1999). The myth of the Caucasian Sprachbund: The case of ergativity. Lingua. 108. 1-29. [1]
Nichols, Johanna. 2003. The Nakh-Daghestanian consonant correspondences. In Dee Ann Holisky and Kevin Tuite (eds.), Current Trends in Caucasian, East European and Inner Asian Linguistics: Papers in honor of Howard I. Aronson, 207-264. Amsterdam: John Benjamins. doi:10.1075/cilt.246.14nic
