Não informado. (1925). Technical news bulletin of the National Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Technical News Bulletin of the National Bureau of Standards. Washington: U.S. Department of Commerce, National Bureau of Standards, 1925.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Technical News Bulletin of the National Bureau of Standards. U.S. Department of Commerce, National Bureau of Standards, 1925.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.