@book { MglichkeitenundGrenzenvonGutscheinenimAffiliateMarketing, title = "Möglichkeiten und Grenzen von Gutscheinen im Affiliate-Marketing", author = "Andreas {Klotz}", year = "2011", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783842814035", url = "https://m.diplom.de/document/228273" }