@book { StoryBrand,
    title = "StoryBrand",
    subtitle = "Wie Sie mit starken Geschichten Ihre Kunden überzeugen",
    author = "Donald {Miller} and Ute {Mareik}",
    year = "2020",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1219131"
}