Werner-Spanhoofd, A. Lehrbuch der deutschen sprache: A practical course in German for high school academy of college / by Arnold Werner-Spanhoofd.
Chicago-referens (17:e uppl.)Werner-Spanhoofd, Arnold. Lehrbuch Der Deutschen Sprache: A Practical Course in German for High School Academy of College / by Arnold Werner-Spanhoofd. London : D. C. Heath & Co., 1921.
MLA-referens (8:e uppl.)Werner-Spanhoofd, Arnold. Lehrbuch Der Deutschen Sprache: A Practical Course in German for High School Academy of College / by Arnold Werner-Spanhoofd.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.