Anthony, David W. (1986). "'The Kurgan Culture', Indo-European Origins, and the Domestication of the Horse: A Reconsideration," Current Anthropology, 27, N. 4, p. 291-304.
2.
Georgiev, Vladimir. (1981). Introduction to the History of Indo-European Languages , Académie bulgare des sciences, 3ème éd.
3.
Gimbutas, Marija. (1982). "Old Europe in the Fifth Millennium B.C. The European Situation on the Arrival of the Indo-Europeans," The Indo-Europeans in the Fourth and the Third Millennia, ed. Edgar C. Polomé, Ann Arbor, Michigan, 1-60.
4.
Haudry, Jean. (1987). La religion cosmique des Indo-Europeans, Milan-Paris, Archè, "Les belles lettres."
5.
Martinet, Andrè. (1986). Des steppes aux océans, L'indo-européen et les "Indo-Européens,"Paris, Payot.
6.
Thomas, Homer L. (1982). "Archaeological Evidence of the Migrations of the Indo-Europeans," The Indo-Europeans in The Fourth and Third Millennia, ed. Edgar C. Polomé , Ann Arbor, Michigan, 61-86.