Editors. "Carthusian monks are executed at Tyburn". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14888, accessed 18 April 2014.]
John Houghton, Prior of the London Charter house, and other Carthusians are found guilty of treason in refusing to acknowledge the royal supremacy (they are executed at Tyburn, May 4th).