1. National Council of Teachers of Mathematics. (2000). Principles and Standards for School Mathematics, Chapter 4: Standards for Grades Pre-K-2. Reston, VA: NCTM.

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2. Conference Board of the Mathematical Sciences. (2001). The Mathematical Education of Teachers, Chapters 1-3. Washington, D.C.: The Mathematical Association of America.

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3. Abramovich. S. (2005). Early Algebra with Graphics Software as a Type II Application of Technology. Computers in the Schools, 22(3/4), 21-33.

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4. Schifter, D. (1998). Learning Mathematics for Teaching: From a Teacher's Seminar to the Classroom. Journal of Mathematics Teacher Education, 1, pp. 55-87.

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5. Abramovich, S. and Cho, E. K. (2009). Mathematics, Computers, and Young Children as a Research-Oriented Learning Environment for a Teacher Candidate. Asia Pacific Education Review, 10(2), pp. 247-259.

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6. Fuys, D.J., and Liebov, A.K. (1993). Geometry and Spatial Sense. In R. Jensen (ed.), Research ideas for the classroom: Early childhood mathematics. NCTM: Reston, VA.