@book { DemokratieinderSchule,
    title = "Demokratie in der Schule",
    author = "Katharina D. {Giesel} and Gerhard {de Haan} and Tobias {Diemer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103434"
}