Classification.
Class P, subclasses PB-PH: modern European languages (with supplementary pages)

APA Citation

Library of Congress. Subject Cataloging Division., Library of Congress. Classification Division., Gale Research Company. (19631966). Classification. Washington.

MLA Citation

Library of Congress. Subject Cataloging Division, Library of Congress. Classification Division, and Gale Research Company. Classification. Washington, 19631966.

Warning: These citations may not always be complete (especially for serials).