Circulars and brochures. U.S. Copyright Office, Library of Congress.
Chicago Style (17th ed.) CitationCirculars and Brochures. [Washington, D.C.]: U.S. Copyright Office, Library of Congress.
MLA (9th ed.) CitationCirculars and Brochures. U.S. Copyright Office, Library of Congress.
Warning: These citations may not always be 100% accurate.