1. PISA 2015: Results in Focushttp://www.oecd.org/pisa/pisa-2015-results-in-focus.pdf
2. Students’ Academic Achievement Still Lags That of Their Peers in Many Other Countrieshttp://www.pewresearch.org/fact-tank/2017/02/15/u-s-students-internationally-math-science/
3. The Opportunity Equation: Transforming Mathematics and Science Education for Citizenship and the Global Economy,2009
4. STEM comes to preschool;Moomaw;Young Child.,2010
5. Math and Science in Preschool: Policies and Practice;Brenneman;Presch. Policy Brief.,2009