@book { SchulreformundSchulverwaltunginBerlin,
    title = "Schulreform und Schulverwaltung in Berlin",
    author = "Gert {Geißler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093928"
}