Ludwig, Christa (Autor Personal)

Mozart, J. C. W. A. The marriage of Figaro, 1956.

Mahler, G. Das Lied von der Erde [SR] 1975, c1982: labels (Christa Ludwig, alto)

Wagner, R. Lohengrin [SR] p1986: container (Christa Ludwig; b. Berlin, 1924)

Grove music online, Aug. 19, 2008 (Ludwig, Christa; b. Mar. 16, 1928, Berlin; German mezzo-soprano)

Int. ww in classical mus., 27th ed. (Ludwig, Christa; born March 16, 1928, Berlin, Germany; Austrian/French mezzo-soprano)

New York times online, April 26, 2021 (obituary published April 25, 2021: Christa Ludwig, mezzo-soprano; born March 16, 1928, Berlin; died Saturday [April 24] at her home in Klosterneuburg, Austria, at age 93; she was associated for decades with the Vienna State Opera and the Salzburg Festival)