@book { MarketingEventsasaSupportiveToolforCustomerLoyalty,
    title = "Marketing Events as a Supportive Tool for Customer Loyalty",
    author = "Gabriela {Strauß}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832462369",
    url = "https://m.diplom.de/document/221683"
}