1. Bernstein, C. (1969, March 7). Age and race fears seen in housing opposition. Washington Post.
2. Butler R., 1975. Why survive? Being old in America Harper & Row, New York.
3. Butler R., Lewis M., 1973. Aging and mental health C. V. Mosby Co, St. Louis, MO.
4. Butler R. N., 1969. The effects of medical and health progress on the social and economic aspects of the life cycle. Industrial Gerontology2:1-9.
5. Lerner M., 1957. America as a civilization: Life and thought in the United States today Simon and Schuster, New York.