@book { DieOpernlibrettinachDramenGabrieledAnnunzios,
    title = "Die Opernlibretti nach Dramen Gabriele d'Annunzios",
    author = "Olaf {Roth}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1087310"
}