@book { WarteschlangenundihreBehandlungalsPhnomendesMarketings,
    title = "Warteschlangen und ihre Behandlung als Phänomen des Marketings",
    author = "Manuel {Maurer}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640957064",
    url = "https://www.hausarbeiten.de/document/174952"
}