^Martin Litchfield West, Indo-European poetry and myth (2007), p. 7.
^Wolfram Euler: Indoiranisch-griechische Gemeinsamkeiten der Nominalbildung und deren indogermanische Grundlagen [= Aryan-Greek Communities in Nominal Morphology and their Indoeuropean Origins]. Innsbruck, 1979 (in German).
^Litchfield West, Martin. The Invention of Homer. Classical Quarterly. 1999, 49 (364).
^Renfrew, A. C., 1987, Archaeology and Language: The Puzzle of Indo-European Origins, London: Pimlico. ISBN0-7126-6612-5; T. V. Gamkrelidze and V. V. Ivanov, The Early History of Indo-European Languages, Scientific American, March 1990
Renfrew, Colin. Time Depth, Convergence Theory, and Innovation in Proto-Indo-European. Languages in Prehistoric Europe. 2003. ISBN 3-8253-1449-9.
^A. Bammesberger in The Cambridge History of the English Language, 1992, ISBN978-0-521-26474-7, p. 32: the model "still remains the background of much creative work in Indo-European reconstruction" even though it is "by no means uniformly accepted by all scholars."