@book { SpracherwerbundKonzeptualisierung,
    title = "Spracherwerb und Konzeptualisierung",
    author = "Stefanie {Haberzettl} and Heide {Wegener}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097058"
}