@book { DieAuswirkungendesEuroaufdasMarketing,
    title = "Die Auswirkungen des Euro auf das Marketing",
    author = "Christian E. {Walter}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434304",
    url = "https://m.diplom.de/document/219099"
}