@book { ProjektcontrollingEinfhrungundberblick,
    title = "Projektcontrolling - Einführung und Überblick",
    author = "Katja {Klotz}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656210511",
    url = "https://www.hausarbeiten.de/document/195203"
}