@book { NachhaltigeGeldanlagen,
    title = "Nachhaltige Geldanlagen",
    author = "Mario {Rothenbücher}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842806078",
    url = "https://m.diplom.de/document/228096"
}