United States. Patent Office. (1900). Official gazette of U.S. Patent Office: Supplement to Vol. 91, containing classification of subjects of invention, so far as revised up to June 30, 1900. GPO.
Chicago Style (17th ed.) CitationUnited States. Patent Office. Official Gazette of U.S. Patent Office: Supplement to Vol. 91, Containing Classification of Subjects of Invention, so Far as Revised Up to June 30, 1900. [Washington]: GPO, 1900.
MLA (9th ed.) CitationUnited States. Patent Office. Official Gazette of U.S. Patent Office: Supplement to Vol. 91, Containing Classification of Subjects of Invention, so Far as Revised Up to June 30, 1900. GPO, 1900.
Warning: These citations may not always be 100% accurate.