@book { DievierShnedesDoktorMarch,
    title = "Die vier Söhne des Doktor March",
    subtitle = "Roman",
    author = "Brigitte {Aubert} and Susanne {Staatsmann}",
    year = "2017",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/364717"
}