@book { Isthereawaytosustainableinvestment,
    title = "Is there a way to sustainable investment?",
    author = "Katja {Treichel}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836615778",
    url = "https://m.diplom.de/document/225938"
}