@book { DasHerzdesPrinzen,
    title = "Das Herz des Prinzen",
    subtitle = "Roman",
    author = "Patricia {Grasso} and Eva {Stadler}",
    year = "2016",
    publisher = "venusbooks",
    address = "München, Deutschland",
    url = "https://www.venusbooks.de/document/338334"
}