1. Almon J 2007 The vital role of play in childhood International Association for Steiner/Waldorf Early Childhood Education http://www.iaswece.org/waldorf_education/articles/education_toward_freedom.aspx
2. Bassok D Latham S Rorem A 2014 Is kindergarten the new first grade? The changing nature of kindergarten in the age of accountability http://curry.virginia.edu/uploads/resourceLibrary/20_Bassok_Is_Kindergarten_The_New_First_Grade.pdf
3. The role of pretend play in children's cognitive development;Bergen;Early Childhood Research and Practice,2002