@book { KonsumentenverhaltenimInternet,
    title = "Konsumentenverhalten im Internet",
    author = "Karina {Geister}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832486945",
    url = "https://m.diplom.de/document/223671"
}