@book { EthicalInvesting,
    title = "Ethical Investing",
    author = "Manfred {Stüttgen}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15969",
    url = "https://www.peterlang.com/document/1111108"
}