APA (7th ed.) Citation

United States. Library of Congress & Library of Congress. Policy and Standards Division. (2009). Library of Congress classification. Q. Science ([2009 ed.].). Library of Congress, Cataloging Distribution Service.

Chicago Style (17th ed.) Citation

United States. Library of Congress and Library of Congress. Policy and Standards Division. Library of Congress Classification. Q. Science. [2009 ed.]. Washington, D.C: Library of Congress, Cataloging Distribution Service, 2009.

MLA (9th ed.) Citation

United States. Library of Congress and Library of Congress. Policy and Standards Division. Library of Congress Classification. Q. Science. [2009 ed.]. Library of Congress, Cataloging Distribution Service, 2009.