@book { DieHoldingAreaOPManagementimWettbewerb,
    title = "Die Holding Area: OP-Management im Wettbewerb",
    author = "Matthias {Schall}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297961"
}