@book { InsourcingoderOutsourcingChancenundRisiken,
    title = "Insourcing oder Outsourcing. Chancen und Risiken",
    author = "Marco {Schumann}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638575119",
    url = "https://www.hausarbeiten.de/document/64785"
}