@book { ArbeitsgedchtnisundRechnenimVorschulalter,
    title = "Arbeitsgedächtnis und Rechnen im Vorschulalter",
    author = "Antje {Ehlert}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103391"
}