@book { DienstleistungsmarketingimITBereich,
    title = "Dienstleistungsmarketing im IT-Bereich",
    author = "Urs {Jacoby}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832452612",
    url = "https://m.diplom.de/document/220829"
}