@book { ElektronischuntersttztesLernenELearning,
    title = "Elektronisch unterstütztes Lernen (E-Learning)",
    author = "Johannes {Bankwitz}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832475789",
    url = "https://m.diplom.de/document/222855"
}