Kermode, Mark (15 February 2008). "Aliens come to Wales". London: Guardian.co.uk. Archived from the original on 18 February 2008. Retrieved 1 March 2008.
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Kermode, Mark (15 February 2008). "Aliens come to Wales". London: Guardian.co.uk. Archived from the original on 18 February 2008. Retrieved 1 March 2008.