Não informado. (1920). Discovery: The magazine of scientific progress. Professional and Industrial Publishing.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Discovery: The Magazine of Scientific Progress. London: Professional and Industrial Publishing, 1920.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Discovery: The Magazine of Scientific Progress. Professional and Industrial Publishing, 1920.
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