Indo-Europeans
References
In Search of the Indo-Europeans: Language, Archaeology, and Myth. by J. P. Mallory. Thames & Hudson; Reprint edition (April, 1991). ISBN: 0500276161 (Link to amazon.com
An Introduction to the Indo-European Languages. by Philip Baldi. Southern Illinois University Press (April, 1983). ISBN: 0809310910 (Link to amazon.com