@book { SpracherwerbundFehleranalyse,
    title = "Spracherwerb und Fehleranalyse",
    author = "Esin Işıl {Gülbeyaz}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108946"
}