14–2:167–214. Renfrew, Colin (1987). Archaeology & Language. The Puzzle of the Indo-European Origins. London: Jonathan Cape. Sykes, Brian. (2001) The Seven Daughters of Eve. London: Corgi Books. Watkins, Calvert. (1995) How to Kill a Dragon: Aspects of Indo-European Poetics. New York: Oxford University Press. External links Encyclopedia of Indo-European Culture (1997) from The American Heritage Dictionary Kurgan culture Genetics Ancient DNA and the Indo-European Question R1a and R1b as markers of the Proto-Indo-European expansion: a review of ancient DNA evidence Ancient peoples Eurasian history Neolithic cultures 4th millennium BC Neolithic Asia Neolithic Europe Bronze Age Asia Bronze Age Europe Nomadic groups in Eurasia