@book { OperationSundownerAlienwchterBand1,
    title = "Operation Sundowner: Alienwächter Band 1",
    author = "Stefan {Hensch}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Germany",
    url = "https://uksakebooks.grin.com/document/502359"
}