Tolong jelaskan mengenai Réferensi dari Anna von Mildenburg

Some of the information in this article comes from the German-language Wikipedia article. See also The Record of Singing by Michael Scott, Volume One (Duckworth, London, 1977), for a synopsis of von Mildenburg's career and an assessment of her singing, and her biographical entry in The Concise Oxford Dictionary of Opera, second edition, edited by Harold Rosenthal and John Warrack (Oxford University Press, London, 1980).