@book { DerfreiwilligeMarktzurCO2KompensationunddieAnwendungimMarketing,
    title = "Der freiwillige Markt zur CO2-Kompensation und die Anwendung im Marketing",
    author = "Bastian {Mutschler}",
    year = "2012",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842832039",
    url = "https://m.diplom.de/document/229234"
}