@book { DerEinsatzvonElectronicCommerceinBauunternehmen,
    title = "Der Einsatz von Electronic Commerce in Bauunternehmen",
    author = "Alexander {Schmidt}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832441265",
    url = "https://m.diplom.de/document/219750"
}