Books
Wittgenstein, Philosophical Investigations, 1973
Johann Huizinga, Homo Ludens, 1938
G.T.W. Patrick, Psychology of Relaxation, 1916
Websites
http://www.uiowa.edu/~lsahunni/lla/playtheories.htm
http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=312008&in_page_id=1770
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