@book { EmotionaleBedingungendesFernstudiums,
    title = "Emotionale Bedingungen des Fernstudiums",
    author = "Sabrina {Matuschke}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842809659",
    url = "https://m.diplom.de/document/228258"
}