@book { VanityDerPreisderSchnheit,
    title = "Vanity - Der Preis der Schönheit",
    author = "Johanna {Marthens}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1002357"
}