Não informado. (1959). Current literature. National Foundation, Department of Professional Education.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Current Literature. New York: National Foundation, Department of Professional Education, 1959.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Current Literature. National Foundation, Department of Professional Education, 1959.
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