Higgins, Sydney. "Isabel Jay"Archived 4 October 2009 at the Wayback Machine, The Golden Age of British Theatre (1880–1920), TheCamerinoPlayers.com, 2009, 29 August 2016
web.archive.org
Higgins, Sydney. "Isabel Jay"Archived 4 October 2009 at the Wayback Machine, The Golden Age of British Theatre (1880–1920), TheCamerinoPlayers.com, 2009, 29 August 2016