APA (7th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division & Library of Congress. Subject Cataloging Division. (1955). Classification. Class P, subclass PQ, part 2: Italian, Spanish and Portuguese literatures. [U. S. Government Printing Office].

Chicago Style (17th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division and Library of Congress. Subject Cataloging Division. Classification. Class P, Subclass PQ, Part 2: Italian, Spanish and Portuguese Literatures. Washington: [U. S. Government Printing Office], 1955.

MLA (9th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division and Library of Congress. Subject Cataloging Division. Classification. Class P, Subclass PQ, Part 2: Italian, Spanish and Portuguese Literatures. [U. S. Government Printing Office], 1955.