@book { DieprivateHochschuleWittenHerdecke,
    title = "Die private Hochschule Witten/Herdecke",
    author = "Michael {Kruska}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832405809",
    url = "https://m.diplom.de/document/216514"
}