APA (7th ed.) Citation

Library of Congress. (1989). Library of Congress classification. Class D Subclasses DT-DX: History of Africa, Australia, New Zealand, etc (Third ed.). Library of Congress, Subject Cataloging Division, Processing Services.

Chicago Style (17th ed.) Citation

Library of Congress. Library of Congress Classification. Class D Subclasses DT-DX: History of Africa, Australia, New Zealand, Etc. Third ed. Washington, D.C: Library of Congress, Subject Cataloging Division, Processing Services, 1989.

MLA (9th ed.) Citation

Library of Congress. Library of Congress Classification. Class D Subclasses DT-DX: History of Africa, Australia, New Zealand, Etc. Third ed. Library of Congress, Subject Cataloging Division, Processing Services, 1989.