Não informado. (1920). Quarterly Publications of the American Statistical Association. American Statistical Association.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Quarterly Publications of the American Statistical Association. Boston, Mass: American Statistical Association, 1920.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Quarterly Publications of the American Statistical Association. American Statistical Association, 1920.
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