(2011) Book: "The Bletchley Park Codebreakers". London: Biteback Publishing ISBN-13: 978-1849540780 contribution in book edited by Michael Smith and Ralph Erskine.
(1993) Book: "Codebreakers: The Inside Story of Bletchley Park". Oxford: Oxford University Press, ISBN 978-0-19-280132-6, contribution in book edited by Harry Hinsley and Alan Stripp,