1. The relationship between initial meaningful and mechanical knowledge of arithmetic;Baroody,1986
2. Constructing cognitive operations linguistically;Beilin,1976
3. The practice of arithmetic in Liberian schools;Brenner;Anthropology and Education Quarterly,1985
4. Analogical learning and transfer: What develops?;Brown,1989
5. Inducing flexible thinking: The problem of access;Brown,1981