@book { WirkungvonWerbungimInternet,
    title = "Wirkung von Werbung im Internet",
    author = "Magnus {Pagendarm}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832446147",
    url = "https://m.diplom.de/document/220228"
}