Christian Wildhagen (2002). "Unveiled Artefact". Friends' Magazine for Friends and Patrons of the Salzburg Festival. Archived from the original on 5 April 2008. Retrieved 15 August 2010.
"Opera Reviews". The Opera Critic. November 2004. Retrieved 15 August 2010.
"Opera Reviews". The Opera Critic. September 2005. Retrieved 15 August 2010.
"Opera Reviews". The Opera Critic. January 2006. Retrieved 15 August 2010.
web.archive.org
Christian Wildhagen (2002). "Unveiled Artefact". Friends' Magazine for Friends and Patrons of the Salzburg Festival. Archived from the original on 5 April 2008. Retrieved 15 August 2010.