Classification.
Class P, subclasses P-PM supplement: Index to languages and dialects.

APA Citation

Library of Congress. Subject Cataloging Division., Library of Congress. Classification Division. Classification. Philology. (1957). Classification: Class P, subclasses P-PM supplement: Index to languages and dialects. 2d ed. Washington: [For sale by the Supt. of Docs., U. S. Govt. Print. Off.].

MLA Citation

Library of Congress. Subject Cataloging Division, and Library of Congress. Classification Division. Classification. Philology. Classification: Class P, Subclasses P-PM Supplement: Index to Languages And Dialects. 2d ed. Washington: [For sale by the Supt. of Docs., U. S. Govt. Print. Off.], 1957.