@book { WirmachenWerbungfrVereine,
    title = "Wir machen Werbung für Vereine",
    author = "Johannes {Vees}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640988990",
    url = "https://www.hausarbeiten.de/document/175855"
}