@book { InternationaleZertifizierungenISO9000ISO14000undEUkoAudit,
    title = "Internationale Zertifizierungen (ISO 9000, ISO 14000 und EU-Öko-Audit)",
    author = "Barbara {Gaisbauer} and Wolfgang {Pointner}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832409845",
    url = "https://m.diplom.de/document/216881"
}