@book { 50TippsfrFhrungsverantwortlichebeiPersonalmangel,
    title = "50 Tipps für Führungsverantwortliche bei Personalmangel",
    author = "Christian {Lummer}",
    year = "2014",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403861"
}