@book { BeschreibungderEntwicklungdesPublicPrivatePartnershipamBeispieldesBundeslandesNRW,
    title = "Beschreibung der Entwicklung des Public Private Partnership am Beispiel des Bundeslandes NRW",
    author = "Micha {Rosenkranz}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/226660"
}