@book { Emissionshandel,
    title = "Emissionshandel",
    subtitle = "Eine Lösung von Umweltproblemen?",
    author = "Anja {Sternitzke}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/228928"
}