APA (7th ed.) Citation

United States. Patent Office. (1872). Classified index of subjects of invention adopted in U.S. Patent Office. U.S. Government Printing Office.

Chicago Style (17th ed.) Citation

United States. Patent Office. Classified Index of Subjects of Invention Adopted in U.S. Patent Office. Washington, D.C.: U.S. Government Printing Office, 1872.

MLA (9th ed.) Citation

United States. Patent Office. Classified Index of Subjects of Invention Adopted in U.S. Patent Office. U.S. Government Printing Office, 1872.