1. American Psychiatric Association. 1980. Diagnostic and Statistical Manual of Mental Disorders, 3rd edn, DSM-III. APA: Washington, DC.
2. American Psychiatric Association. 1987. Diagnostic and Statistical Manual of Mental Disorders, 3rd edn, revised, DSM-III-R. APA: Washington, DC.
3. American Psychiatric Association. 1994. Diagnostic and Statistical Manual of Mental Disorders, 4th edn, DSM-IV. APA: Washington, DC.
4. The Cause of Delirium in Patients With Hip Fracture
5. Epidemiology of Delirium