@book { GenerationsbeziehungeninderSchule,
    title = "Generationsbeziehungen in der Schule",
    author = "Anja {Schwertfeger}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03168-3",
    url = "https://www.peterlang.com/document/1047535"
}