TY  - GEN
AU  - Cowan, Richard
AU  - Renton, Margaret
TI  - Do they know what they are doing? children's use of economical addition strategies and knowledge of commutativity
KW  - Psicologia e Educacao
KW  - 3500 - Psicologia Educacional
UR  - https://catalogo.ispa.pt/opac/biblioteca/localizacao_doc/r4.htm
ER  -