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Hansen, Kirstine and Jones, Elizabeth and Joshi, Heather and Budge, David (2010) Initial Findings of the fourth sweep of the Millennium Cohort Study.
Vorhaus, John and Duckworth, Kathryn and Budge, David and Feinstein, Leon (2008) The Social and personal benefits of learning: A summary of key research findings. Centre for Research on the Wider Benefits of Learning, Institute of Education, University of London, London. ISBN 978 -0-9559488-0-0