@book { SchmetterlingeimKopfLiebesroman,
    title = "Schmetterlinge im Kopf (Liebesroman)",
    author = "Frederika {Mai}",
    year = "2020",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/429348"
}