@book { GedchtnisspielefrSenioren,
    title = "Gedächtnisspiele für Senioren",
    author = "Ursula {Oppolzer}",
    year = "2022",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/1292661"
}