1. Fourth grade everyday mathematics: Field test version;Bell,1993
2. Arithmetic: The last holdout;Bums;Phi Delta Kappan,1994
3. A field test of fourth grade everyday mathematics;Carroll,1994
4. A constructivist alternative to the representational view of mind in mathematics education;Cobb;Journal for Research in Mathematics Education,1992
5. Discovery learning and constructive;Davis,1990