Geary, D. C., Boykin, A. W., Embretson, S., Reyna, V., Siegler, R., Berch, D. B., & Graban, J. (2008). Report of the task group on learning processes.National mathematics advisory panel, reports of the task groups and subcommittees, 4-1. Recuperado de https://www2.ed.gov/about/bdscomm/list/mathpanel/report/final-report.pdf