@book { PuccinitheThinker,
    title = "Puccini the Thinker",
    subtitle = "The Composer's Intellectual and Dramatic Development",
    author = "John Louis {Digaetani}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    url = "https://www.peterlang.com/document/1092613"
}