Não informado. (1971). Official Gazette of the United States Patent and Trademark Office. U.S. Department of Commerce.
Chicago-viite (17. p.)Não informado. Official Gazette of the United States Patent and Trademark Office. Washington: U.S. Department of Commerce, 1971.
MLA-viite (8. p.)Não informado. Official Gazette of the United States Patent and Trademark Office. U.S. Department of Commerce, 1971.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.