^Thorpe, Vanessa (4 February 2007). "Laughing all the way to the Banksy". The Guardian. ISSN 0029-7712. Archived from the original on 8 June 2019. Retrieved 8 June 2019.
^Akbar, Arifa (10 October 2007). "Rude jokes that will fetch thousands at auction". The Independent. Archived from the original on 22 December 2015. Retrieved 17 December 2015.