@book { EthikbasierteInvestmentfonds,
    title = "Ethikbasierte Investmentfonds",
    author = "Petra {Delbeck}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836604123",
    url = "https://m.diplom.de/document/225323"
}