@book { MultipleCoBranding,
    title = "Multiple Co-Branding",
    subtitle = "From the Consumer's Point of View",
    author = "Inca {Beckmann} and Kristina {Willas}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832485535",
    url = "https://m.diplom.de/document/223753"
}