Encyclopedia of Indo-European culture. Mallory, J. P., Adams, Douglas Q. London: Fitzroy Dearborn. 1997. pp. 30. ISBN978-1884964985. OCLC37931209. «Armenian presence in their historical seats should then be sought at some time before c 600 BC; ... Armenian phonology, for instance, appears to have been greatly affected by Urartian, which may suggest a long period of bilingualism.»
Wilhelm, Gernot (2008). «Urartian». En Woodard, Roger D., ed. The Ancient Languages of Asia Minor. Cambridge: Cambridge University Press. pp. 105–123.
Wilhelm, Gernot (2008). «Hurrian». En Woodard, Roger D., ed. The Ancient Languages of Asia Minor. Cambridge: Cambridge University Press. pp. 81–104.
Encyclopedia of Indo-European culture. Mallory, J. P., Adams, Douglas Q. London: Fitzroy Dearborn. 1997. pp. 30. ISBN978-1884964985. OCLC37931209. «Armenian presence in their historical seats should then be sought at some time before c 600 BC; ... Armenian phonology, for instance, appears to have been greatly affected by Urartian, which may suggest a long period of bilingualism.»