@book { WirkungsuntersuchungimEventMarketing,
    title = "Wirkungsuntersuchung im Event-Marketing",
    author = "Bianca {Macht}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842805323",
    url = "https://m.diplom.de/document/224055"
}