@book { SupplierRelationshipManagement,
    title = "Supplier Relationship Management",
    author = "Deniz {Cetin}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832493295",
    url = "https://m.diplom.de/document/224450"
}