@book { MichelangeloStudienIII,
    title = "Michelangelo Studien III",
    subtitle = "Das jüngste Gericht und seine Vorgeschichte",
    author = " {Anonym}",
    year = "1977",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1069844"
}