Sibylle Ehrismann: Fünfzig Jahre Collegium Musicum Zürich: Leitung Paul Sacher; die Konzerte des Kammerorchesters Collegium Musicum Zürich 1941/42–1991/92. Atlantis-Musikbuch-Verlag, Zürich [u. a.] 1994
Hans Werner Henze's network of artists. Digital letter edition, https://henze-digital.zenmem.de/A08010EA (Version 6.0.0 of August 31, 2024)
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