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Alberta Education. The Alberta K–9 Mathematics Program of Studies with Achievement Indicators. Edmonton, AB: Alberta Education, 2007.
. Diagnostic Mathematics Program, Division II, Operations. Edmonton, AB: Alberta Education, 1990.
. Math 5 Live. Edmonton, AB: Alberta Education, 2003.
Barton, Mary Lee and Clare Heidema. Teaching Reading in Mathematics: A Supplement to Teaching Reading in the Content Areas Teacher’s Manual. 2nd ed. Aurora, CO: Mid-continent Research for Education and Learning (McREL), 2002.
National Council of Teachers of Mathematics. Principles and Standards for School Mathematics. Reston, VA: NCTM, 2000.
. Curriculum and Evaluation Standards for School Mathematics. Reston, VA: NCTM, 1989.
Reys, Barbara J. Developing Number Sense in the Middle Grades. Reston, VA: National Council of Teachers of Mathematics, 1992.
. "Estimation and Mental Computation: It's 'About' Time." Arithmetic Teacher 34, 1 (September 1986), pp. 22–23.
Reys, Robert E. "Estimation." Arithmetic Teacher 32, 6 (February 1985), pp. 37–41.
Van de Walle, John A. and LouAnn H. Lovin. Teaching Student-Centered Mathematics: Grades 5–8. Boston, MA: Pearson Education, Inc., 2006.