@book { LanguageAttritionDownunder,
    title = "Language Attrition Downunder",
    subtitle = "German Speakers in Australia",
    author = "Margit {Waas}",
    year = "1996",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1082713"
}