@book { SchulpolitikimWandel,
    title = "Schulpolitik im Wandel",
    author = "Rita {Nikolai}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-07040-8",
    url = "https://www.peterlang.com/document/1050612"
}