@book { KleineGrneMonsterDiePoolparty,
    title = "Kleine Grüne Monster - Die Poolparty",
    author = "Daniel {Isberner} and Natascha {Schmidt}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/996816"
}