@book { DueDiligenceRealEstate,
    title = "Due Diligence Real Estate",
    author = "Julia {Arndt}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832476106",
    url = "https://m.diplom.de/document/222886"
}