APA (7th ed.) Citation

United States. Library of Congress. Processing Services. (1980). Library of Congress filing rules. Library of Congress.

Chicago Style (17th ed.) Citation

United States. Library of Congress. Processing Services. Library of Congress Filing Rules. Washington, D.C: Library of Congress, 1980.

MLA (9th ed.) Citation

United States. Library of Congress. Processing Services. Library of Congress Filing Rules. Library of Congress, 1980.

Warning: These citations may not always be 100% accurate.