@book { DerWitwer,
    title = "Der Witwer",
    subtitle = "Psychothriller",
    author = "Jonnie {Jacobs} and Imke {Walsh-Araya}",
    year = "2019",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/501096"
}