1. Carnegie, Task Forces on Meeting the Needs of Young Children. Starting points: meeting the needs of our youngest children, New York, Carnegie Corporation of New York, 1994, Apr.
2. Carnegie, Task Force on Learning in the Primary Grades. Years of promise: a comprehensive learning strategy for America's children, New York, Carnegie Corporation of New York, 1996 Sep.
3. Fertile minds;Nash;Time,1997
4. Stability and change in human characteristics;Bloom,1961
5. Environment and experience;Hunt,1961