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Twigg, E. and Redford, P. (2014) How to use t-tests to explore pre-post change. In: Vossler, A. and Moller, N. , eds. (2014) The Counselling and Psychotherapy Research Handbook. London: SAGE, pp. 151-163. ISBN 9781446255278 Available from: http://eprints.uwe.ac.uk/24540