@book { AnforderungenanBenutzerinformationenausderSichtdesMarketing,
    title = "Anforderungen an Benutzerinformationen aus der Sicht des Marketing",
    author = "Thomas {Crull}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832435424",
    url = "https://m.diplom.de/document/219203"
}