@book { KennzahlenimSupplyChainManagement,
    title = "Kennzahlen im Supply Chain Management",
    author = "Christian {Kunzendorf}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638740548",
    url = "https://www.hausarbeiten.de/document/73078"
}