@book { DerMarktforschungsprozess,
    title = "Der Marktforschungsprozess",
    author = "Alexandra {Oberste-Dommes}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638349611",
    url = "https://www.hausarbeiten.de/document/34857"
}