TY  - BOOK
AU  - Helmore,G.A.
ED  - Pergamon Press
TI  - Piaget: a practical consideration : a consideration of the general theories and work of Jean Piaget, with an account of a short follow up study of his work on the development of the concept of geometry 
T2  - The Commonwealth and international library
SN  - 0080068936
U1  - 155.413092  22
PY  - 1969///.
CY  - Oxford: 
PB  - Pergamon Press, 
KW  - Piaget, Jean,
KW  - Child psychology
KW  - Παιδική ψυχολογία
N1  - Includes bibliography: p. 73
ER  -