National Child Development Study and 1970 British Cohort Study technical report : changes in the NCDS and BCS70 populations and samples over time /
Plewis, Ian.
Bedford Group for Lifecourse & Statistical Studies.Centre for Longitudinal Studies.
London : Centre for Longitudinal Studies, Bedford Group for Lifecourse and Statistical Studies, Institute of Education, University of London,
2004.
Cover title.
"October 2004."