@book { DieEGkoAuditVerordnung,
    title = "Die EG-Öko-Audit-Verordnung",
    author = "Gero {Danckwerts}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832439460",
    url = "https://m.diplom.de/document/219585"
}