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Bynner, John and Foudouli, Vanessa and Parsons, Sam (2005) Measuring basic skills for longitudinal study: the design and development of instruments for use with cohort members in the age 34 follow-up in the 1970 British Cohort Study (BCS70). National Research and Development Centre for adult literacy and numeracy, Institute of Education, University of London, London. ISBN 1-905188-08-0
