Não informado. (1872). Official Gazette of the United States Patent Office. U.S. Patent Office, Department of Congress.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Official Gazette of the United States Patent Office. Washington: U.S. Patent Office, Department of Congress, 1872.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Official Gazette of the United States Patent Office. U.S. Patent Office, Department of Congress, 1872.
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