Não informado. (1920). Discovery: The magazine of scientific progress. Professional and Industrial Publishing.
Citace podle Chicago (17th ed.)Não informado. Discovery: The Magazine of Scientific Progress. London: Professional and Industrial Publishing, 1920.
Citace podle MLA (8th ed.)Não informado. Discovery: The Magazine of Scientific Progress. Professional and Industrial Publishing, 1920.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..