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Engel, U and Jann, B and Lynn, P and Scherpenzeel, A and Sturgis, P (2014) 'Improving survey methods: General Introduction.' In: Engel, U and Jann, B and Lynn, P and Scherpenzeel, A and Sturgis, P, (eds.) Improving survey methods: lessons from recent research. Routledge. ISBN 978-0-415-83625-8