unknown. (2011). Colour therapy healing. Available:http://www.colourtherapyhealing.com/colour/blue.php. Last accessed 8th Nov 2011
Erskine. (unknown). FRIEZE magazine Issue 68 June -August 2002 Catherine Yass.. Available: http://www.frieze.com/issue/review/catherine_yass/. Last accessed 8th Nov 2011
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Adams,P & Hilty G (2000). Catherine Yass: Works, 1994-2000. London: asprey jacques. p4-30.
For the websites put [online] after the title
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