@book { Krperspracheeinfachnutzen,
    title = "Körpersprache einfach nutzen",
    author = "Yvonne {de Bark}",
    year = "2014",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403295"
}