1. J. Kilpatrick, J. Swafford, and B. Findel, Adding It Up: Helping Children Learn Mathematics (National Academy Press, Washington DC, 2001).
2. S. Leinwand, D.J. Brahier, and D. Huinker, Principles to Actions: Ensuring Mathematical Success For All (NCTM, Reston VA, 2014).
3. National Governors Association Center for Best Practices & Council of Chief State School Officers, Common Core State Standards For Mathematics (NGA Center & CCSSO, Washington DC, 2010).
4. K. Cartwright, Proceeding of Mathematics Education Research Group of Australasia 41, 202 (2018).
5. National Council of Teachers of Mathematics, Procedural Fluency in Mathematics (NCTM, Reston VA, 2014).