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2. “Emotional reactions to surgery,”;Spielberger;Journal of Counseling and Clinical Psychology,1973
3. Anxiety and Behavior;Spielberger,1966
4. Basic Anxiety: A New Psycho-biological Concept;Garre,1962
5. “The emotional stress of the preoperative patient,”;Totas;Journal of the American Association of Nurse Anesthetists,1978