@book { DasSchwanenmdchen,
    title = "Das Schwanenmädchen",
    subtitle = "Kriminalroman: Kommissar Rohleff ermittelt Band 3",
    author = "Eva {Maaser}",
    year = "2021",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/279499"
}