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Sylva, K. and Stein, A. and Leach, Penelope and Barnes, Jacqueline and Malmberg, L.E. (2011) Effects of early child-care on cognition, language, and task-related behaviours at 18 months: an English study. British Journal of Developmental Psychology 29 (1), pp. 18-45. ISSN 0261-510X.