1. Lang, P.J. , Bradley, M.M. , & Cuthbert, B.N. (1997). International Affective Picture System (IAPS): Technical manual and affective ratings. Gainesville, FL: NIMH Center for the Study of Emotion and Attention, University of Florida.
2. Laird, J.D. & Bresler, C. (1992). The process of emotional experience: A self-perception theory. Review of Personality and Social Psychology, 13, 213–234.
3. Poeck, K. (1969). Pathophysiology of emotional disorders associated with brain damage. In P.O. Vinken & G.W. Bruyn (Eds.), Handbook of neurology (Vol. 3, pp. 343–367). New York: Elsevier.
4. Izard, C.E. (1971). The face of emotion. New York: Appleton-Century-Crofts.
5. James, W. (1950). The principles of psychology (Vol. 2). New York: Dover Publications. (Original work published 1890).