@book { DasmysteriseTaschentuch,
    title = "Das mysteriöse Taschentuch",
    author = "Ulrike Ina {Schmitz}",
    year = "2018",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/997007"
}