@book { AnlageoptionendeutscherInvestoreninRohstoffe,
    title = "Anlageoptionen deutscher Investoren in Rohstoffe",
    author = "Pierre {Gliesche}",
    year = "2012",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/296499"
}