@book { IntegrationvonQualittsmanagementundMarktforschungsmethoden,
    title = "Integration von Qualitätsmanagement- und Marktforschungsmethoden",
    author = "Jens {Thomas}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832419646",
    url = "https://m.diplom.de/document/217808"
}