1. Facial Efference and the Experience of Emotion
2. Adler, A. (1929). The science of living. London: Allen & Unwin.
3. Alford, G. S. (1981). Sedatives, hypnotics, and minor tranquilizers. In S. J. Mule (Ed.), Behavior in excess @p. 39-63). New York: Free. Press.
4. The Three Arousal Model: Implications of Gray's Two-Factor Learning Theory for Heart Rate, Electrodermal Activity, and Psychopathy