@book { InderRuheliegtdeineKraft,
    title = "In der Ruhe liegt deine Kraft",
    subtitle = "Wirksame Wege zu mehr Gelassenheit in einer lauten Welt.",
    author = "Dr. Christoph {Augner}",
    year = "2021",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1108902"
}