@book { DasEinheitsgesangbuchGOTTESLOB,
    title = "Das Einheitsgesangbuch GOTTESLOB",
    author = "Udo {Hildenbrand}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106579"
}