@book { Theimpactofmultivendorloyaltyprogramsontheconsumersonlinepurchaseprocess,
    title = "The impact of multi-vendor loyalty programs on the consumers' online purchase process",
    author = "Vanessa {Ostertag}",
    year = "2018",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/450749"
}