@book { MarktsegmentierungimITBereich,
    title = "Marktsegmentierung im IT-Bereich",
    author = "Michael {Lang}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656054382",
    url = "https://www.hausarbeiten.de/document/182037"
}