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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.