@book { DasLiedunseresSommers,
    title = "Das Lied unseres Sommers",
    author = "Penelope {Stokes} and Heidi {Lichtblau}",
    year = "2020",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/590641"
}