@book { UmweltkonomieundUmweltpolitik,
    title = "Umweltökonomie und Umweltpolitik",
    author = "Eberhard {Feess} and Andreas {Seeliger}",
    year = "2021",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221382"
}