@book { CorporateIdentityfrBanken,
    title = "Corporate Identity für Banken",
    author = "Oliver {Ibielski}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434243",
    url = "https://m.diplom.de/document/219093"
}