1. Schnur, J. O. and Lang, J. W.Nov. 1976. Just pushing buttons or learning---a case for minicalculators. Arithmetic Teacher23:7 pp. 559–563.
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2. Cech, J. P.Feb. 1972. The effect of the use of desk calculators on attitude and achievement with low-achieving ninth graders. Mathematics Teacher65:153–186.
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3. This program was developed by the author at A Learning Place, an educational clinic in Berkeley and Oakland, California. Over forty fifth and sixth graders were involved in its development.
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4. The following programs all stress the meaning and experience of arithmetic and numbers: Nuffield Mathematics Project (published for the Nuffield Foundation by John Wiley & Sons, New York, 1967). Individual titles are: I do and I understand (the guide); Computation and structure; Shape and size; and Graphs leading to algebra.