University of Zambia Library Search for 'su:"Categorization Psychology"'

The development of logical thinking in pre-school Zambian children :

By Okonji, M. O.. Lusaka : Human Development Research Unit, University of Zambia, 1972 , Bibliography: leaf [14]

By Lakoff, George. Chicago : The University of Chicago Press, 1987 . xvii, 614 pages : 0226468038

Cambridge : Press Syndicate of the University of Cambridge, 1987 . x, 317 pages : 0521322197