TY  - BOOK
AU  - Keats,J.A.
AU  - Collis,Kevin F.
AU  - Halford,Graeme S.
TI  - Cognitive development: research based on a neo-Piagetian approach 
SN  - 0471995053
PY  - 1978///
CY  - Chichester
PB  - John Wiley & Sons
KW  - Cognition in children
N1  - Includes indexes; Bibliography : p. 429-446
ER  -