@book { MammamiaMeinezgelloseMutter,
    title = "Mamma mia - Meine zügellose Mutter",
    subtitle = "Erotischer Roman",
    author = "Enrico {Lombardi}",
    year = "2020",
    publisher = "venusbooks",
    address = "München, Deutschland",
    url = "https://www.venusbooks.de/document/542124"
}