1. President's Council of Advisors on Science and Technology (PCAST), Prepare and Inspire: K–12 Education in Science, Technology, Engineering and Math (STEM) Education for America's Future (PCAST, Executive Office of the President, Washington, DC, 2010).
2. Ferrini-Mund J. et al.. Knowing Mathematics (Research report PROM/SE Michigan State University East Lansing MI 2006); www.promse.msu.edu/_documents/PROMSE_KnowingMath.pdf.
3. Abell Foundation, Teacher Certification Reconsidered: Stumbling for Quality (The Abell Foundation, Baltimore, 2001).
4. Kanstoroom M., Finn C. E., Eds., Better Teachers, Better Schools (The Thomas B. Fordham Foundation, Washington, DC, 1999).
5. Center for Research in Mathematics and Science Education Breaking the Cycle: An International Comparison of U.S. Mathematics Teacher Preparation (Michigan State University East Lansing MI 2010); http://usteds.msu.edu.