@book { MglichkeitenundGrenzenderOnlineMarktforschung,
    title = "Möglichkeiten und Grenzen der Online-Marktforschung",
    author = "Markus {Nolden}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836616447",
    url = "https://m.diplom.de/document/225975"
}