Caedmon, July 2014
Cornerstone Digital, July 2014
Harper Perennial Modern Classics, July 2005
Harper, March 2015
Harper, October 2018
Harper Perennial Modern Classics, May 2006
HarperCollins Espanol, June 2015
Vintage Books USA, February 2004
Heinemann Educational Books, September 1966
Amereon Limited, October 2005