@book { AktivierenrundumsJahr,
    title = "Aktivieren rund ums Jahr",
    author = "Katja {Borchert-Giel}",
    year = "2022",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1224117"
}