@book { ABCderPflegedienstleitung,
    title = "ABC der Pflegedienstleitung",
    author = "Siegfried {Charlier}",
    year = "2013",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403807"
}