Cita APA

U. S. Library of Congress. Subject Cataloging Division, Gale Research Company, Library of Congress. Subject Cataloging Division, & Helen Savage. (1973). Library of Congress Classification schedules, a cumulation of additions and changes, 1971-1972. Class D. History: General and old world. Gale Research Company.

Citación estilo Chicago

U. S. Library of Congress. Subject Cataloging Division, Gale Research Company, Library of Congress. Subject Cataloging Division, and Helen Savage. Library of Congress Classification Schedules, a Cumulation of Additions and Changes, 1971-1972. Class D. History: General and Old World. Detroit, Michigan: Gale Research Company, 1973.

Cita MLA

U. S. Library of Congress. Subject Cataloging Division, et al. Library of Congress Classification Schedules, a Cumulation of Additions and Changes, 1971-1972. Class D. History: General and Old World. Gale Research Company, 1973.