@book { HumanittundVernunft,
    title = "Humanität und Vernunft",
    subtitle = "Eine Studie zu Heinrich Manns Roman «Henri Quatre»",
    author = "Gerhard {Köpf}",
    year = "1975",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1069797"
}