@book { MusiktheaterinHamburgum1800,
    title = "Musiktheater in Hamburg um 1800",
    author = "Claudia {Maurer Zenck}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100163"
}