(1935). Research and progress: A ... review of German science. [s.n.].
Chicago-referens (17:e uppl.)Research and Progress: A ... Review of German Science. Berlin: [s.n.], 1935.
MLA-referens (8:e uppl.)Research and Progress: A ... Review of German Science. [s.n.], 1935.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.