1. A study of developmentally appropriate and developmentally inappropriate kindergarten classrooms: Activity types and experiences;Abshire,1991
2. Helping children cope with stress;Allen;Early Child Development and Care,1988
3. Observational study of behavior: Sampling methods;Altmann;Behavior,1974
4. Early childhood development: Prenatal through age eight;Anselmo,1987
5. Stress in early childhood;Anthony,1959