@book { KommunikationimELearningamBeispieldesProblemBasedLearning,
    title = "Kommunikation im E-Learning am Beispiel des Problem Based Learning",
    author = "Antje {Haim}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656170327",
    url = "https://www.hausarbeiten.de/document/192207"
}