Cita APA (7th ed.)

United States. Library of Congress. (1990). Library of Congress classification schedules combined with additions and changes through 1989, class P, subclasses P-M supplement index to languages and dialects. Gale Research.

Cita Chicago (17th ed.)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989, Class P, Subclasses P-M Supplement Index to Languages and Dialects. Detroit: Gale Research, 1990.

Cita MLA (9th ed.)

United States. Library of Congress. Library of Congress Classification Schedules Combined with Additions and Changes Through 1989, Class P, Subclasses P-M Supplement Index to Languages and Dialects. Gale Research, 1990.