@book { BusinessProcessOutsourcingimPersonalbereich,
    title = "Business Process Outsourcing im Personalbereich",
    author = "Dorothee {Schulz}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832493813",
    url = "https://m.diplom.de/document/224517"
}