@book { EinfhrungeinesQualittsmanagementsystems,
    title = "Einführung eines Qualitätsmanagementsystems",
    author = "Manuel {Seybold}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836648639",
    url = "https://m.diplom.de/document/227866"
}