WWW The Guardian, consultado el 27-3-2019---31-8-2018 (The German soprano Inge Borkh, who has died aged 97, b. Ingeborg Simon in Mannheim (some sources have her birth year as 1917 rather than 1921))
The New Grove Dictionary of Opera, MacMillan, 1996---(Borkh, Inge; n. el 26 de mayo de 1917, Mannheim; nombre real Ingeborg Simon; soprano)
