@book { ImmortalDieMaskedesMrders,
    title = "Immortal - Die Maske des Mörders",
    author = "Johanna {Marthens}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1002360"
}