@book { EinneuerVertragPerimeterverteidigungBuch3LitRPGSerie,
    title = "Ein neuer Vertrag (Perimeterverteidigung Buch 3) LitRPG-Serie",
    author = "Michael {Atamanov}",
    year = "2021",
    publisher = "Magic Dome Books",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1043513"
}