1. Albert, M. S. (1994). Brief assessments of cognitive function in the elderly. In M. P. Lawton & J. Teresi (Eds.), Annual review of gerontology and geriatrics (Vol. 14, pp. 93–106). New York: Springer.
2. Alexopoulos, G. S. (1993). Treatment of depression. In C. Salzman (Ed.), Clinical geriatric psycho-pharmacology (pp. 137–176). Baltimore, MD: Williams & Wilkins.
3. American Psychiatric Association. (1987). Diagnostic and statistical manual of mental disorder (3rd ed., revised). Washington, DC: Author.
4. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorder (4th ed.). Washington, DC: Author.
5. Angst, J. (1980). Course of unipolar depressive, bipolar manic-depressive, and schizoid affective disorders: Results of a longitudinal study. Fortschritte Der Neurologie-Psyciatrie, 48, 3–30.