@book { UnternehmennutzenKunst,
    title = "Unternehmen nutzen Kunst",
    author = "Sarah-Maria {Schmidt}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836624329",
    url = "https://m.diplom.de/document/226440"
}