@book { EinunheimlicherGast,
    title = "Ein unheimlicher Gast",
    subtitle = "Roman",
    author = "Gillian {White} and Isabella {Bruckmaier}",
    year = "2016",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/343810"
}