@book { DieFarbendesverschwundenenSommers,
    title = "Die Farben des verschwundenen Sommers",
    author = "Oliver {Schlick}",
    year = "2019",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/457821"
}