@book { DirektinvestitioneninMexiko,
    title = "Direktinvestitionen in Mexiko",
    author = "Cordula {Schulz}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832481131",
    url = "https://m.diplom.de/document/223338"
}