Behr, Merlyn J. and Thomas R. Post. "Teaching Rational Number and Decimal Concepts." In Thomas R. Post (ed.), Teaching Mathematics in Grades K–8 (Boston, MA: Allyn and Bacon, 1992), pp. 201–248. http://www.education.umn.edu/rationalnumberproject/92_2.html (Accessed August  8, 2007).

Donovan, M. Suzanne and John D. Bransford (eds.). How Students Learn: Mathematics in the Classroom. Washington, DC: The National Academies Press, 2005.

Donovan, M. Suzanne and John D. Bransford. "Introduction." In M. Suzanne Donovan and John D. Bransford (eds.), How Students Learn: Mathematics in the Classroom (Washington, DC: The National Academies Press, 2005), pp. 1–26.

Fuson, Karen C., Mindy Kalchman and John D. Bransford. "Mathematical Understanding: An Introduction." In M. Suzanne Donovan and John P. Bransford (eds.), How Students Learn: Mathematics in the Classroom (Washington, DC: The National Academies Press, 2005), pp. 217–256).

Galileo Educational Network. "Area is a Square Deal." Galileo Educational Network. 2002–2007. http://www.galileo.org/math/investigations/area.html (Accessed August 8, 2007).

Jacobson, Michael J. and Uri Wilensky. "Complex Systems in Education: Scientific and Educational Importance and Implications for the Learning Sciences." Journal of the Learning Sciences 15, 1 (2006), pp. 11–34.

Kilpatrick, Jeremy, Jane Swafford and Bradford Findell (eds.). Adding It Up: Helping Children Learn Mathematics. Washington, DC: National Academy Press, 2001.

Utah State University. National Library of Virtual Manipulatives. Geometry (Grades 3–5). http://nlvm.usu.edu/en/nav/category_g_2_t_3.html (Accessed August 8, 2007).

Wilensky, Uri. "What Is Normal Anyway? Therapy for Epistemological Anxiety." Educational Studies in Mathematics 33, 2 (1997), pp. 171–202.