1. “A survey of preoperative fear,”;Ramsay;Anaesthesia,1972
2. Psychological Stress: Psychoanalytic and Behavioral Studies of Surgical Patients;Janis,1958
3. Developing the Art of Understanding;Johnson,1967
4. “Evaluation of anxiety and fear in adult surgical patients,”;Graham;Nursing Research,1971
5. “Relationship of preoperative anxiety to perception of postoperative pain,”;Bruegel;Nursing Research,1971