Snow, Joseph T., y Arno Gimber. «Richard Strauss, Stefan Zweig, Joseph Gregor and the Story of the <i>Celestina< i> Opera That Almost Was, With a Bibliographical Appendix of <i>Celestina< I> Operas in the Twentieth Century». Celestinesca 31 (enero 15, 2021): 133–162. Accedido septiembre 20, 2024. https://turia.uv.es/index.php/celestinesca/article/view/20074.