Não informado. (1928). German Quarterly. American Association of Teachers of German.
Chicago-referens (17:e uppl.)Não informado. German Quarterly. Philadelphia, Pa: American Association of Teachers of German, 1928.
MLA-referens (8:e uppl.)Não informado. German Quarterly. American Association of Teachers of German, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.