@book { 100TippsfrdieValidation,
    title = "100 Tipps für die Validation",
    author = "Barbara {Messer}",
    year = "2010",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403690"
}