@book { CDMundMikrofinanzprojekte,
    title = "CDM- und Mikrofinanzprojekte",
    author = "Alexander {Wirth}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836635059",
    url = "https://m.diplom.de/document/227154"
}