@book { PlanungvonWerbezielen,
    title = "Planung von Werbezielen",
    author = "Johannes {Neumann}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638120517",
    url = "https://www.hausarbeiten.de/document/3349"
}