@book { EntwicklungundEinfhrungeinesQualittsmanagementsystems,
    title = "Entwicklung und Einführung eines Qualitätsmanagementsystems",
    author = "Heiko {Dreyer}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832404574",
    url = "https://m.diplom.de/document/216423"
}