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 - 0080068928 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 -