Hiebert, James, Relationships between Research and the NCTM Standards, Journal for Research in Mathematics Education, 1999, 30 (1): 3–19, JSTOR 749627, doi:10.2307/749627
jstor.org
Hiebert, James, Relationships between Research and the NCTM Standards, Journal for Research in Mathematics Education, 1999, 30 (1): 3–19, JSTOR 749627, doi:10.2307/749627