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Jump up^ Beal. (1986) p. 426

Jump up^ Mallory, J. P.; Adams, Douglas Q. (1997). Encyclopedia of Indo-European culture. Taylor & Francis. pp. 4–6. ISBN 978-1-884964-98-5. Retrieved 24 March 2012.

Jump up^ Puhvel, J. (1994). "Anatolian: Autochton or Interloper". Journal of Indo-European Studies. 22 (3 & 4): 251–264.

^ Jump up to:^a b Steiner, G. (1990). "The Immigration of the First Indo-Europeans into Anatolia Reconsidered". Journal of Indo-European Studies. 18 (1 & 2): 185–214.

Jump up^ Mallory, J. (1989). "In Search of the Indo-Europeans". New York: Thames and Hudson.

Jump up^ Renfrew, C. (1999). "Time Depth, Convergence Theory, and Innovation in Proto-Indo-European: 'Old Europe' as a PIE Linguistic Area". Journal of Indo-European Studies. 27(3 & 4): 257–294.

Jump up^ Renfrew, C. (1987). "Archaeology and Language. The puzzle of Indo-European Origins". Cambridge University Press.

Jump up^ Atkinson, Q.; et al. (2014). "Mapping the Origins and Expansion of the Indo-European Language Family". Science. 337 (6097): 957–960. doi:10.1126/science.1219669.PMC 4112997. PMID 22923579