@book { UnterrichtsforschungimFachEnglisch,
    title = "Unterrichtsforschung im Fach Englisch",
    author = "Holger {Limberg} and Olaf {Jäkel}",
    year = "2016",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b10401",
    url = "https://www.peterlang.com/document/1049708"
}