1. The state of preschool 2008: State preschool yearbook;Barnett,2008
2. The state of preschool: 2003 preschool yearbook;Barnett,2003
3. Scaffolding children's learning: Vygotsky and early childhood education;Berk,1995
4. Tools of the mind. The Vygotskian approach to early childhood education;Bodrova,1996
5. Eager to learn: Educating our preschoolers,2001