Title: Effectiveness of concrete and computer simulated manipulatives on elementary students' learning skills and concepts in experimental probability
Description: <a href="http://uf.catalog.fcla.edu/uf.jsp?st=UF027788261&ix=pm&I=0&V=D&pm=1" rel="nofollow">http://uf.catalog.fcla.edu/uf.jsp?st=UF027788261&ix=pm&I=0&V=D&pm=1</a>