A concise biographical dictionary of singers from the beginning of recorded sound to the present
Kutsch, K. J.
Riemens, Leo.
Jones, Harry Earl.
Philadelphia London (67 Jermyn St., S.W.1) Chilton Book Company
1969
Originally published as 'Unvergängliche Stimmen: kleines Sängerlexicon'. 2.Aufl. Bern: Francke, 1966
Singers.