@book { Acomparisonofclassroomdiscourseintwocountries,
    title = "A comparison of classroom discourse in two countries",
    author = "Katrin {Strobelberger}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842820173",
    url = "https://m.diplom.de/document/228608"
}