@book { Wasmichstarkmacht,
    title = "Was mich stark macht",
    author = "Klaus-Dieter {Kolenda}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403716"
}