@book { NachhaltigeGeldanlage,
    title = "Nachhaltige Geldanlage",
    author = "Frank {Schröder}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832494087",
    url = "https://m.diplom.de/document/224542"
}