1. 1. Academy for Educational Development: Never Too Old to Learn Report to the Edna McConnell Clark Foundation New York 1974 p 66.
2. 2. Baltes PB Schaie KW: Aging and IQ: The myth of the twilight years. Psychol Today 7:35-36 (March) 1974.
3. 3. Stone V: Nursing of older people. In Behavior and Adaptation in Later Life. Boston Little Brown and Company 1969 p 315.
4. 4. Maccoby EE Jones TH Konrad KW: Selective listening in later life. In Interdisciplinary Topics in Gerontology vol 1: Psychological Funçtioning in the Normal and Senile Aged. New York S. Karger 1968 p 49.
5. 5. Caird WK: Aging and short term memory. J Gerontol 21:297299 (April) 1966.