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2. Play, playfulness, creativity and innovation Bateson, P. P. G. (Paul Patrick Gordon), 1938- Cambridge : Cambridge University Press, 2013. DSA317
5. Play culture in a changing world Kalliala, Marjatta, Maidenhead, Berkshire, England : Open University Press, 2006. DSA317
6. Play, dreams, and imitation in childhood Piaget, Jean, 1896-1980, Abingdon, Oxon ; Routledge, Taylor & Francis Group, 2013. SW322 SW527
