@book { DieDueDiligencebeiUnternehmenstransaktionen,
    title = "Die Due Diligence bei Unternehmenstransaktionen",
    author = "Christina {Hagen}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656526018",
    url = "https://www.hausarbeiten.de/document/263819"
}