1. Learning and Teaching Early Math
2. National Association for the Education of Young Children (NAEYC) and National Council of Teachers of Mathematics (NCTM). Early childhood mathematics: Promoting good beginnings. NAEYC and NCTM Washington D.C. 2010. National Association for the Education of Young Children (NAEYC) and National Council of Teachers of Mathematics (NCTM). Early childhood mathematics: Promoting good beginnings . NAEYC and NCTM Washington D.C. 2010.
3. C. T. Cross T. A. Woods and H. Schweingruber. Mathematics learning in early childhood: Paths toward excellence and equity. National Academies Press Washington D.C. 2009. C. T. Cross T. A. Woods and H. Schweingruber. Mathematics learning in early childhood: Paths toward excellence and equity . National Academies Press Washington D.C. 2009.