@book { KindgemesFremdsprachenlernen,
    title = "Kindgemäßes Fremdsprachenlernen",
    subtitle = "Zur Theorie und Praxis des Frühbeginns Englisch",
    author = "Petra {Pfitzer}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1102729"
}