@book { EinfachKreativStricken,
    title = "Einfach. Kreativ. Stricken!",
    author = "Heidi {Grund-Thorpe}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403408"
}