1. American Psychiatric Association (1980) Diagnostic and Statistical Manual of Mental Disorders, 3rd edn. American Psychiatric Association, Washington, DC.
2. American Psychiatric Association (1987) Diagnostic and Statistical Manual of Mental Disorders, 3rd edn, revised. American Psychiatric Association, Washington, DC.
3. American Psychiatric Association (1994) Diagnostic and Statistical Manual of Mental Disorders (DSM-IV). American Psychiatric Association, Washington, DC.
4. and (1978) Multilingual Aphasia Examination. University of Iowa, Iowa City.
5. The frequently low cobalamin levels in dementia usually signify treatable metabolic, neurologic and electrophysiologic abnormalities