@book { ZeitgeistGenossen,
    title = "Zeitgeist-Genossen",
    subtitle = "Das Berliner Programm der SPD von 1989- Motive - Ziele - Folgen",
    author = "Wolfgang {Bok}",
    year = "1995",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1115652"
}