APA

United States, . (1993). Guide for the preparation of patent drawings. Washington, D.C: U.S. Dept. of Commerce, Patent and Trademark Office.

Chicago

United States, . 1993. Guide for the preparation of patent drawings. Washington, D.C: U.S. Dept. of Commerce, Patent and Trademark Office.

Harvard

United States, . (1993). Guide for the preparation of patent drawings. Washington, D.C: U.S. Dept. of Commerce, Patent and Trademark Office.

MLA

United States, . Guide for the preparation of patent drawings. Washington, D.C: U.S. Dept. of Commerce, Patent and Trademark Office. 1993.