The development of logical thinking in pre-school Zambian children : classification /
Okonji, M. O.
The development of logical thinking in pre-school Zambian children : classification / M. O. Okonji. - Lusaka : Human Development Research unit, 1972. - 13 p. : ill. - H. D. R. U. reports; 23 .
Logic -- in infancy & childhood
The development of logical thinking in pre-school Zambian children : classification / M. O. Okonji. - Lusaka : Human Development Research unit, 1972. - 13 p. : ill. - H. D. R. U. reports; 23 .
Logic -- in infancy & childhood