Damasio, A. (1994) Descartes' error: emotion, reason, and the human brain. New York: G.P.Putnam. (available in paperback for under $10: Avon Books, ISBN: 0380726475 )

LeDoux, J. (1998) The Emotional Brain: The mysterious underpinnings of emotional life. New York: Touchstone. (available in paperback for under $10. 384 pages, ISBN: 0-684-83659-9)