Não informado. (1920). Discovery: The magazine of scientific progress. Professional and Industrial Publishing.
Chicago-Zitierstil (17. Ausg.)Não informado. Discovery: The Magazine of Scientific Progress. London: Professional and Industrial Publishing, 1920.
MLA-Zitierstil (8. Ausg.)Não informado. Discovery: The Magazine of Scientific Progress. Professional and Industrial Publishing, 1920.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.