@book { ClassroomManagement,
    title = "Classroom-Management",
    subtitle = "Wie Lehrer, Eltern und Schüler guten Unterricht gestalten",
    author = "Christoph {Eichhorn}",
    year = "2015",
    publisher = "Klett-Cotta",
    address = "Stuttgart, Deutschland",
    url = "https://klett.openpublishing.com/document/393917"
}