@book { InternetbasedPurchasing,
    title = "Internet-based Purchasing",
    subtitle = "Einsatz von E-Sourcing, E-Procurement & Warenterminbörsen im Einkauf",
    author = "Alexander {Brinz}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832443610",
    url = "https://m.diplom.de/document/219972"
}