@book { FacilityManagementimkommunalenBereich,
    title = "Facility Management im kommunalen Bereich",
    author = "Stefan {Prinz}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832418472",
    url = "https://m.diplom.de/document/217698"
}