↑ Catford, JC (1977). "Mountain of Tongues: The Languages of the Caucasus". Annual Review of Anthropology . 6 : 283– 314. doi : 10.1146/annurev.an.06.100177.001435 . JSTOR 2949334 .
↑ Catford, JC (1977). Siegel, Bernard J. (編). "Mountain of Tongues: The Languages of the Caucasus" . Annual Review of Anthropology . 6 : 290. doi : 10.1146/annurev.an.06.100177.001435 . ISBN9780824319069。