@book { HKGreiffunddiestummenZeugen,
    title = "HK Greiff und die stummen Zeugen",
    author = "Wolf G. {Rahn}",
    year = "2019",
    publisher = "Uksak E-Books",
    address = "Lengerich, Germany",
    url = "https://uksakebooks.grin.com/document/457666"
}