Peter Nicholls and David Langford. "Entropy". The Encyclopedia of Science Fiction edited by John Clute, David Langford, Peter Nicholls and Graham Sleight. London: Gollancz, updated 14 February 2017. Web. Accessed 1 June 2019. <http://www.sf-encyclopedia.com/entry/entropy>.
John Clute. "Chiang, Ted". The Encyclopedia of Science Fiction edited by John Clute, David Langford, Peter Nicholls and Graham Sleight. London: Gollancz, updated 18 May 2019. Web. Accessed 1 June 2019. <http://www.sf-encyclopedia.com/entry/chiang_ted>.