Пара книг по индоевропейской проблеме:
Anthony D.W. The Horse, the Wheel, and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the Modern World. Princeton,UK. 2007.
http://ifolder.ru/26984733 Mallory J.P. In seach of Indo-Europeans. Language, Archaeology and Myth. London., 1989.
http://ifolder.ru/26985064