"A Wounded Stage: Drama and World War I" by Mary Luckhurst, in A Companion to Modern British and Irish Drama, 1880–2005 (2006), Mary Luckhurst (Ed.), page 310, accessed at Google Books, 22/12/2010
Modern British Drama: The Twentieth Century (2002), Christopher D. Innes, page 261, accessed at Google Books, 24/12/2010