大英百科全书, 15th edition (1986): Macropedia, "Languages of the World", see section titled "Caucasian languages".
^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
^Chirikba, Viacheslav. 1996. Common West Caucasian: The Reconstruction of its Phonological System and Parts of its Lexicon and Morphology. Leiden: Research School CNWS, School of Asian, African, and Amerindian Studies. ISBN 978-9073782716.
^Klimov, G. Etymological Dictionary of the Kartvelian Languages. Berlin: Mouton de Gruyter. 1998.
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Kovalevskaia, V. B "Central Ciscaucasia in Antiquity and Early Middle Ages: Caucasian Substratum and Migrations of the Iranic-Speaking Tribes." (1988).