@book { MarketingundVertriebscontrollingEineAbgrenzung,
    title = "Marketing- und Vertriebscontrolling: Eine Abgrenzung",
    author = "Peter {Schumann}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297699"
}