1. Bakal, D. A., Kaganov, J. A., and Demjen, S. (1983). Headache assessment from a severity perspective. In Holroyd, K. A., Schlote, B., and Zenz, H. (eds.),Perspectives in Headache Research on Headache, C. F. Holgrefe, Lewiston, New York, Toronto.
2. Blanchard, E. B., and Andrasik, F. (1985).Management of Chronic Headaches: A Psychological Approach, Pergamon Press, New York.
3. Cameron, R. (1978). The clinical implementation of behavior change techniques. In Foreyt, J. P., and Rathjen, D. P. (eds.),Cognitive Behavior Therapy: Research and Application, Plenum Press, New York, London.
4. Demjen, S., and Bakal, D. (1981). Illness behavior and chronic headache.Pain 10: 221?229.
5. Follick, M. J., Zitter, R. E., and Ahern, D. K. (1983). Failures in the operant treatment of chronic pain. In Foa, E. B., and Emmelkamp, P. M. G. (eds.),Failures in Behavior Therapy, John Wiley & Sons, New York.