1. Definitions and conceptual issues;Schipper,1990
2. Human Memory: Theory and Practice;Baddeley,1990
3. Factor Analysis;Gorsuch,1983
4. A scale for assessing quality of life in adult asthma sufferers;Hyland;J Psychosom Res,1991
5. Steroid prescribing for asthmatics: association with pulmonary function, Asthma Symptom Checklist, and Living with Asthma Questionnaire;Hyland;Thorax.,1991