@book { AffiliateMarketingalsInstrumentdesOnlineMarketing,
    title = "Affiliate-Marketing als Instrument des Online-Marketing",
    author = "Katrin {Schmithüsen}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640973545",
    url = "https://www.hausarbeiten.de/document/176075"
}