1. The Expression of the Emotions in Man and Animals;Darwin,1872
2. Beauchaine TP, Zalewski M: Physiological and developmental mechanisms of emotional liability in coercive relationships. In Oxford Handbook of Coercive Relationship Dynamics. Edited by Dishion TJ, Snyder JJ, Oxford University Press, in press.
3. The Nature of Emotion;Ekman,1994
4. The Development of Emotion Regulation: Biological and Behavioral Considerations,1994
5. Vagal tone and the physiological regulation of emotion;Porges;Monogr Soc Res Child,1994