@book { Doppeltverliebthltbesser,
    title = "Doppelt verliebt hält besser",
    author = "Anne {Gard}",
    year = "2019",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Germany",
    url = "https://shop.digitalpublishers.de/document/471396"
}