The Al Hirschfeld Foundation – “RHINOCEROS” – http://www.alhirschfeldfoundation.org/piece/rhinoceros
New York Public Radio Archives, Interview regarding Opera Stage Design – https://www.wnyc.org/story/leo-kerz/
Zum Abschied Ein Fest – Chapter 15 – Leo Kerz – https://www.rowohlt.de/taschenbuch/helmut-kindler-zum-abschied-ein-fest.html
Settings designed by Leo Kerz – Harvard Theatre Collection – http://id.lib.harvard.edu/alma/990013701730203941/catalog
Wikipedia for Leo Kerz (German) – https://de.m.wikipedia.org/wiki/Leo_Kerz