@book { DerSommerderZitronenblten,
    title = "Der Sommer der Zitronenblüten",
    subtitle = "Preishit - Drei Romane in einem E-Book",
    author = "Roberta {Gregorio}",
    year = "2016",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/319024"
}