1. Mathematics their way;Baratta-Lorton,1976
2. Developmentally appropriate practice in early childhood programs;Bredekamp,1997
3. Developmentally-appropriate practice in early childhood programs serving children from birth through age 8,1987
4. The ecology of human development: Experiments by design and nature;Bronfenbrenner,1979
5. Ecology of the family as a context for human development: Research perspectives;Bronfenbrenner;Developmental Psychology,1986