@book { ChangeManagement,
    title = "Change Management",
    subtitle = "Zielvorstellungen und Vorgehensweisen",
    author = "Guenko Hristov {Guenkov}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832428686",
    url = "https://m.diplom.de/document/218595"
}