@book { MoralischesHandelnausSelbstinteresse,
    title = "Moralisches Handeln aus Selbstinteresse",
    author = "Anika {Nagel}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640445080",
    url = "https://www.hausarbeiten.de/document/136758"
}