@book { SchulsponsoringdurchITUnternehmen,
    title = "Schulsponsoring durch IT-Unternehmen",
    author = "Julia {Rüter}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832447373",
    url = "https://m.diplom.de/document/220336"
}