@book { GrundlagenderInternetMarktforschung,
    title = "Grundlagen der Internet-Marktforschung",
    author = "Matthias {Rohe}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832447960",
    url = "https://m.diplom.de/document/220384"
}