@book { BlendedELearning,
    title = "Blended E-Learning",
    subtitle = "Strategie, Konzeption, Praxis",
    author = "Inna {Schmidt}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832498016",
    url = "https://m.diplom.de/document/224918"
}