@book { LetzteAbrechnunginSilverrock,
    title = "Letzte Abrechnung in Silverrock",
    author = "John F. {Beck}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Germany",
    url = "https://uksakebooks.grin.com/document/509479"
}