1. Loeser JD. Perspectives on pain. In: Proceedings of the First World Conference on Clinical Pharmacology and Therapeutics. London: Macmillan, 1980; 313–316.
2. Pain and suffering: A reappraisal;Fordyce;Am Psychologist,1988
3. The Nature of Suffering and the Goals of Medicine;Cassel,1991
4. Classification of Chronic Pain: Description of Chronic Pain Syndromes and Definitions of Pain Terms;Merskey;Pain,1986
5. The Open Society and Its Enemies, ed;Popper,1966