TY  - BOOK
AU  - David.  R Olson
TI  - Cognitive Development : The child`s acquisition of diagonality
U1  - 153.4 
PY  - 1970///
CY  - New York
PB  - Academic Press
N1  - David.  R Olson: Cognitive Development : The child`s acquisition of diagonality..  New York.  Academic Press, 1970.--(153.4OLS)
ER  -