Não informado. (1971). Official Gazette of the United States Patent and Trademark Office. U.S. Department of Commerce.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Official Gazette of the United States Patent and Trademark Office. Washington: U.S. Department of Commerce, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Official Gazette of the United States Patent and Trademark Office. U.S. Department of Commerce, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.