APA (7th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division. (1957). Classification. Class M: Music and books on music (Second edition.). [U. S. Government Printing Office].

Chicago Style (17th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division. Classification. Class M: Music and Books on Music. Second edition. Washington: [U. S. Government Printing Office], 1957.

MLA (9th ed.) Citation

U. S. Library of Congress. Subject Cataloging Division. Classification. Class M: Music and Books on Music. Second edition. [U. S. Government Printing Office], 1957.