File:KS Christa Ludwig, Prof. Maria Venuti (16937597639) (cropped).jpg - Simple English Wikipedia, the free encyclopedia
Radio Swiss Jazz
Christa Ludwig, Mezzo-Soprano of Velvety Hues, Is Dead at 93 - The New York Times
Christa Ludwig in memoriam - Mahler: Symphony no.2 "Urlicht" - Leonard Bernstein (Score & Subtitles) - YouTube
Barbara Ludwig - Wikidata
Mezzosopraan: Enya, Christa Ludwig, Fiorenza Cossotto, Marilyn Horne, Anne Sofie von Otter, Giulietta Simionato, Jard van Nes, Julia Culp - Bron: Wikipedia: 9781232573814 - AbeBooks
Christa Ludwig er død | KlassiskMusikk.com
Christa Ludwig, Mezzo-Soprano of Velvety Hues, Is Dead at 93 - The New York Times
Christa Ludwig (Mezzo-soprano) - Short Biography
File:KS Christa Ludwig, Prof. Maria Venuti, Prof. Dr. Gertraud Berka-Schmid, Dr. Thomas Angyan (16936232390).jpg - Wikimedia Commons