@book { InvestorRelationsimInternet,
    title = "Investor Relations im Internet",
    subtitle = "Eignung nach Nutzung des Internets als Instrument der Investor Relations",
    author = "Cornelia {Sonntag}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434489",
    url = "https://m.diplom.de/document/219116"
}