1. Zborowsky M. People in pain. San Francisco: Jossey-Bass, 1969
2. Fordyce WE. Behavioral methods for chronic pain and illness. St Louis: CV Mosby, 1976
3. Sternbach RA. Pain patients: traits and treatment. New York: Academic Press, 1974
4. Brena SF. Pain and religion. Springfield, Ill: Charles C Thomas, 1972:85–8