@book { Ethischinvestieren,
    title = "Ethisch investieren",
    author = "Manfred {Stüttgen}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11694",
    url = "https://www.peterlang.com/document/1048461"
}