@book { OnlineMarketinginderVersicherungsbranche,
    title = "Online-Marketing in der Versicherungsbranche",
    author = "Markus {Isenmann}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832424671",
    url = "https://m.diplom.de/document/218264"
}