@book { SchattenpferdederRockyMountains,
    title = "Schattenpferde der Rocky Mountains",
    author = "Natascha {Birovljev}",
    year = "2019",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1382389"
}