APA (7th ed.) Citation

Library of Congress. Research Services. (1929). L.C. classification: Additions and changes; Class R, Medicine (2nd edition, 1921), covering all changes through Feb. 1928. GPO.

Chicago Style (17th ed.) Citation

Library of Congress. Research Services. L.C. Classification: Additions and Changes; Class R, Medicine (2nd Edition, 1921), Covering All Changes Through Feb. 1928. [Washington]: GPO, 1929.

MLA (9th ed.) Citation

Library of Congress. Research Services. L.C. Classification: Additions and Changes; Class R, Medicine (2nd Edition, 1921), Covering All Changes Through Feb. 1928. GPO, 1929.