Snow, J.T. y Gimber, A. 2021. 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, (ene. 2021), 133–162. DOI:https://doi.org/10.7203/Celestinesca.31.20074.