Não informado. (2000). Technical news from the National Bureau of Standards. U.S. Department of Commerce.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Technical News from the National Bureau of Standards. Washington: U.S. Department of Commerce, 2000.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Technical News from the National Bureau of Standards. U.S. Department of Commerce, 2000.
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