Report of the National Child Development Study (1958 Cohort) ; submitted to the Central Advisory Council for Education (England) / [by M.L. Kellmer Pringle, N.R. Butler, R. Davie]. - Pringle, Mia Kellmer, 1920-; Butler, N. R. (Neville Roy), 1920-; Davie, Ronald, 1929- (Studies in child development, 1966)