@book { ModellBerlin,
    title = "Modell Berlin",
    subtitle = "Schule und Schulpolitik in Berlin in der zweiten Hälfte des 20. Jahrhunderts",
    author = "Tobias {Rülcker}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1102738"
}