@book { YUMBusinessCaseStudy,
    title = "YUM! Business Case Study",
    author = "Nihat {Canak}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638575058",
    url = "https://www.hausarbeiten.de/document/64775"
}