@book { WirsindinKontaktmiteinander,
    title = "Wir sind in Kontakt miteinander!",
    author = "Christina {Hofmann}",
    year = "2012",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403780"
}