@book { DaskostenloseperiodischeDruckwerk,
    title = "Das kostenlose periodische Druckwerk",
    author = "Liane {Vollmer-Gärtner}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06084-3",
    url = "https://www.peterlang.com/document/1049819"
}