@book { DokumentationdesELearningSystemsMoodle,
    title = "Dokumentation des E-Learning Systems Moodle",
    author = "Tamara {Rachbauer}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836625821",
    url = "https://m.diplom.de/document/226540"
}