APA (7th ed.) Citation

U.S. Library of Congress. Subject Cataloging Division, Gale Research Inc, Runchock, R., & Droste, K. (1989). Class P. Subclasses P-PM. Supplement. Index to languages and dialects: Library of Congress classification schedules combined with additions and changes through 1988. Gale Research Inc.

Chicago Style (17th ed.) Citation

U.S. Library of Congress. Subject Cataloging Division, Gale Research Inc, Rita Runchock, and Kathleen Droste. Class P. Subclasses P-PM. Supplement. Index to Languages and Dialects: Library of Congress Classification Schedules Combined with Additions and Changes Through 1988. Detroit, Michigan: Gale Research Inc, 1989.

MLA (9th ed.) Citation

U.S. Library of Congress. Subject Cataloging Division, et al. Class P. Subclasses P-PM. Supplement. Index to Languages and Dialects: Library of Congress Classification Schedules Combined with Additions and Changes Through 1988. Gale Research Inc, 1989.