1. American Psychiatric Association (1980). Diagnostic and statistical manual of mental disorders, 3rd ed. Washington, DC: Author.
2. American Psychiatric Association (1987). Diagnostic and statistical manual of mental disorders, 3rd ed., revised. Washington, DC: Author.
3. American Psychiatric Association (1993). Diagnostic and statistical manual of mental disorders, 4th ed., draft criteria. Washington, DC: Author.
4. Baltes, M. M., & Barton, E. M. (1977). New approaches toward aging: A case for the operating model. Educational Gerontology, 2, 383–405.
5. Benedict, K. B., & Nacoste, D. B. (1990). Dementia and depression in the elderly: A framework for addressing difficulties in the differential diagnosis. Clinical Psychology Review, 10, 513–537.