@book { InvestorRelations,
    title = "Investor Relations",
    subtitle = "Eine qualitative Studie zum Informationsverhalten von Privatanlegern am Beispiel eines Investmentclubs",
    author = "Gabriela {Mellen}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832480462",
    url = "https://m.diplom.de/document/223279"
}