התפתחות – הבדלי גרסאות

{{הערה|Haaften, A.W.; Korthals, Michiel; Wren, T.E. (Eds.), (1997), Philosophy of Development, Reconstructing the Foundations of Human Development and EducationSeries: Philosophy and Education, Vol. 8, Kluwer, Dordrecht, p. 14}}