@book { ZeichenderZeit,
    title = "Zeichen der Zeit",
    author = "Michael {Butter} and Regina {Grundmann} and Christina {Sanchez-Stockhammer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104822"
}