Văn liệu Tiếng Đức chuẩn Đức

Dürscheid, Christa; Giger, Nadio (2010), “Variation in the case system of German – linguistic analysis and optimality theory” (PDF), trong Lenz, Alexandra N.; Plewnia, Albrecht (biên tập), Grammar between Norm and Variation, Frankfurt am Main: Peter Lang, ISBN 978-3-631-61004-6
Fox, Anthony (1990), The Structure of German, New York: Oxford University Press, Inc., ISBN 978-0-19-815821-9
Horvath, Barbara M.; Vaughan, Paul (1991), Community languages: a handbook, Multilingual Matters, Multilingual Matters, ISBN 978-1853590917
Russ, Charles (1994), The German Language Today: A Linguistic Introduction, London: Routledge, ISBN 978-0-203-42577-0
Sanders, Ruth H. (2010), German: Biography of a Language: Biography of a Language, New York: Oxford University Press, Inc., ISBN 978-0-19-538845-9

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