Stockigt , Janice Beverley. “A Volume of Beethoven’s Lieder in the Childhood of Alexandra Feodorovna (1872–1918), the Last Empress of Russia”. Journal of Music Research Online 13 (July 9, 2023). Accessed December 4, 2024. https://www2.jmro.org.au/index.php/main/article/view/55.