@book { XanthippeDieFraudesSokratesDieehrloseHerzogin,
    title = "Xanthippe - Die Frau des Sokrates & Die ehrlose Herzogin",
    subtitle = "Zwei historische Romane in einem Band",
    author = "Robert {Gordian}",
    year = "2015",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/308030"
}