@book { VonPinguinenundWeihnachtstrumen,
    title = "Von Pinguinen und Weihnachtsträumen",
    author = "Karo {Stein}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1421665"
}